claude idiot

TODO.md

@@ -14,6 +14,7 @@ update m3u8 matching files in spotify to files in collection
 
 ### prepare for decks
 
+store ANLZ in metadata directory by isrc
 create data/usb directory
 convert to mp3 v0 jstereo
     - output into the data/usb directory

justfile

@@ -40,13 +40,50 @@ sockseek input:
 collection ids="7f5tPIfj21UJI4zfDmH4rx 6sAl8LhU6ediFNJRuQQIQX":
     cd maple-py && uv run python -m maple.collection {{ids}}
 
+# Build a rekordbox USB layout at <dst> from the collection at <src>.
+# Converts FLAC→MP3 V0, extracts artwork, writes ANLZ (with PWAV/PWV3
+# blue/white waveforms) and PIONEER/rekordbox/export.pdb.
+export src="data/collection" dst="data/usb":
+    cd maple-py && uv run python -m maple "{{justfile_directory() / src}}" "{{justfile_directory() / dst}}"
+
 sync args:
     s5cmd {{args}}
 
-usb dst="/Volumes/MAPLE":
+# Sync data/usb/ → mounted USB stick (default /media/ntr/MAPLE), then
-    COPYFILE_DISABLE=1 rsync -rtvh --delete --size-only --no-perms --no-owner --no-group --modify-window=2 maple-py/data/usb/Contents/ {{dst}}/Contents/
+# safely unmount so the stick can be pulled without risk to the FAT
-    COPYFILE_DISABLE=1 rsync -rtvh --delete --size-only --no-perms --no-owner --no-group --modify-window=2 --exclude='USBANLZ/' maple-py/data/usb/PIONEER/ {{dst}}/PIONEER/
+# write-back cache.
-    rm -f {{dst}}/PIONEER/rekordbox/RBFLTR.DAT
+usb dst="/media/ntr/MAPLE":
+    @test -d {{dst}} || (echo "USB not mounted at {{dst}}"; exit 1)
+    rsync -rtvh --delete --size-only --no-perms --no-owner --no-group --modify-window=2 "{{justfile_directory()}}/data/usb/" "{{dst}}/"
+    sync
+    @# Try udisksctl first (no sudo, handles the udev event); fall back to
+    @# plain `umount` if udisks isn't available. Either way the recipe
+    @# exits 0 even if the unmount fails (e.g. someone has a file open).
+    @udisksctl unmount -b "$(findmnt -no SOURCE {{dst}})" 2>/dev/null && echo "unmounted {{dst}}" \
+        || (umount {{dst}} 2>/dev/null && echo "unmounted {{dst}}") \
+        || echo "warning: could not unmount {{dst}} — close any file browsers + retry"
+
+# Build a FAT32 image of data/usb/ — ready to dd onto a stick.
+# `size` must exceed the data/usb/ tree (rough rule: data size + ~50 MB FAT overhead).
+usb-image size="2G" img="data/maple.img":
+    @command -v mcopy >/dev/null || (echo "mtools not installed (apt install mtools)"; exit 1)
+    @test -d "{{justfile_directory()}}/data/usb" || (echo "no data/usb (run \`just export\` first)"; exit 1)
+    rm -f "{{justfile_directory()}}/{{img}}"
+    truncate -s {{size}} "{{justfile_directory()}}/{{img}}"
+    mkfs.vfat -F 32 -n MAPLE "{{justfile_directory()}}/{{img}}"
+    cd "{{justfile_directory()}}/data/usb" && mcopy -i "{{justfile_directory()}}/{{img}}" -s -Q -p -m * ::/
+    @echo "image ready:" && ls -lh "{{justfile_directory()}}/{{img}}"
+
+# DESTRUCTIVE: dd data/maple.img onto a block device (e.g. /dev/sdb).
+# Double-check `lsblk` first — wrong device wipes that drive.
+[confirm("usb-flash will OVERWRITE the entire device. Proceed?")]
+usb-flash dev img="data/maple.img":
+    @test -b {{dev}} || (echo "{{dev}} is not a block device"; exit 1)
+    @test -f "{{justfile_directory()}}/{{img}}" || (echo "no image at {{img}}; run \`just usb-image\` first"; exit 1)
+    @lsblk -no NAME,SIZE,LABEL,MODEL {{dev}}
+    sudo dd if="{{justfile_directory()}}/{{img}}" of={{dev}} bs=4M status=progress oflag=direct conv=fsync
+    sudo sync
+    @echo "done — safe to remove (try: udisksctl power-off -b {{dev}})"
 
 usb-pdb dst="/Volumes/MAPLE":
     @test -d {{dst}}/PIONEER/rekordbox || (echo "no rekordbox dir at {{dst}}/PIONEER"; exit 1)

maple-py/pyproject.toml

@@ -9,10 +9,12 @@ authors = [
 requires-python = ">=3.14"
 dependencies = [
     "aiohttp>=3.10",
+    "aubio>=0.4.9",
     "kaitaistruct>=0.11",
     "loguru>=0.7",
     "mutagen>=1.47.0",
     "pillow>=12.2.0",
+    "polars>=1.0",
     "pyrekordbox>=0.4.4",
 ]
 

maple-py/pyrightconfig.json

@@ -0,0 +1,23 @@
+{
+    "include": [
+        "src",
+        "tests"
+    ],
+    "extraPaths": [
+        "src"
+    ],
+    "exclude": [
+        "**/__pycache__",
+        "**/.venv",
+        "data",
+        "re"
+    ],
+    "venvPath": ".",
+    "venv": ".venv",
+    "pythonVersion": "3.14",
+    "pythonPlatform": "Linux",
+    "typeCheckingMode": "basic",
+    "reportMissingImports": "error",
+    "reportMissingModuleSource": "warning",
+    "useLibraryCodeForTypes": true
+}

maple-py/src/maple/analyze.py

@@ -0,0 +1,293 @@
+"""Audio analysis: analytical BPM detection + waveform envelope extraction.
+
+ffmpeg decodes the source to 44.1 kHz mono float32 PCM on stdout. The
+samples are then either streamed in hop-size chunks into aubio.tempo for
+BPM detection, or fully buffered and binned to produce the per-column
+amplitude envelopes that PWAV / PWV3 ANLZ sections embed.
+
+The decoded audio never touches disk — ffmpeg's `-f f32le` output is
+piped straight to numpy.
+"""
+from __future__ import annotations
+
+import json
+import shutil
+import subprocess
+from base64 import b64decode, b64encode
+from pathlib import Path
+
+import aubio
+import numpy as np
+import polars as pl
+from loguru import logger
+
+HOP_SIZE = 512
+WIN_SIZE = 1024
+SAMPLE_RATE = 44100
+MIN_BEATS = 8
+
+# Waveform envelope dimensions.
+PREVIEW_COLS = 400        # PWAV is fixed at 400 columns (1 byte/col).
+SCROLL_FPS = 150          # PWV3 = ~150 columns/sec across the whole track.
+PWAV_LEVELS = 31          # PWAV/PWV3 stores 5-bit heights (bit 5 = white flag).
+
+
+def _stream_pcm(path: Path):
+    """Yield successive hop-sized float32 numpy arrays of mono PCM.
+
+    Pads the final chunk with zeros so every yield is exactly HOP_SIZE samples
+    (aubio.tempo requires fixed-size inputs).
+    """
+    proc = subprocess.Popen(
+        ["ffmpeg", "-nostdin", "-v", "error",
+         "-i", str(path),
+         "-f", "f32le", "-ac", "1", "-ar", str(SAMPLE_RATE), "-"],
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE,
+    )
+    try:
+        assert proc.stdout is not None
+        bytes_per_chunk = HOP_SIZE * 4  # float32
+        while True:
+            buf = proc.stdout.read(bytes_per_chunk)
+            if not buf:
+                break
+            arr = np.frombuffer(buf, dtype=np.float32)
+            if len(arr) < HOP_SIZE:
+                pad = np.zeros(HOP_SIZE - len(arr), dtype=np.float32)
+                arr = np.concatenate([arr, pad])
+            yield arr
+    finally:
+        if proc.poll() is None:
+            proc.terminate()
+        proc.wait()
+
+
+def detect_bpm(path: Path) -> float | None:
+    """Return the analytical BPM of `path`, or None on failure.
+
+    Uses median-of-intervals (via polars), which is robust against
+    aubio's "live" running-average swings on transient sections.
+    """
+    if not shutil.which("ffmpeg"):
+        logger.warning("ffmpeg not on PATH; BPM detection disabled")
+        return None
+
+    tempo = aubio.tempo("default", WIN_SIZE, HOP_SIZE, SAMPLE_RATE)
+    beats: list[float] = []
+    try:
+        for chunk in _stream_pcm(path):
+            if tempo(chunk):
+                beats.append(tempo.get_last_s())
+    except Exception as e:
+        logger.warning("BPM detection failed for {}: {}", path.name, e)
+        return None
+
+    if len(beats) < MIN_BEATS:
+        return None
+    intervals = pl.Series(
+        [beats[i + 1] - beats[i] for i in range(len(beats) - 1)]
+    )
+    median_interval = intervals.median()
+    if not median_interval or median_interval <= 0:
+        return None
+    return 60.0 / median_interval
+
+
+def _decode_pcm(path: Path) -> np.ndarray:
+    """Decode `path` to a 1D float32 numpy array of mono PCM at SAMPLE_RATE.
+
+    Returns an empty array on ffmpeg failure.
+    """
+    if not shutil.which("ffmpeg"):
+        logger.warning("ffmpeg not on PATH; cannot extract waveform")
+        return np.empty(0, dtype=np.float32)
+    proc = subprocess.run(
+        ["ffmpeg", "-nostdin", "-v", "error",
+         "-i", str(path),
+         "-f", "f32le", "-ac", "1", "-ar", str(SAMPLE_RATE), "-"],
+        capture_output=True,
+    )
+    if proc.returncode != 0:
+        logger.warning("ffmpeg failed for {}: {}", path.name,
+                       proc.stderr.decode("utf-8", "replace").strip())
+        return np.empty(0, dtype=np.float32)
+    return np.frombuffer(proc.stdout, dtype=np.float32)
+
+
+def _bin_amplitudes(samples: np.ndarray, n_bins: int, levels: int = PWAV_LEVELS) -> bytes:
+    """Split `samples` into `n_bins` contiguous windows, take the peak |s| per
+    window, quantise to 0..levels, and return one byte per bin.
+
+    Quantising at 5-bit resolution matches PWAV's `bits 0-4 = height` encoding;
+    bit 5 (the "white overshoot" flag) is left at 0 for now — most CDJ firmware
+    is happy without it.
+    """
+    if n_bins <= 0 or len(samples) == 0:
+        return bytes(n_bins)
+    chunks = np.array_split(np.abs(samples), n_bins)
+    peaks = np.array([float(c.max()) if len(c) else 0.0 for c in chunks])
+    peak_max = float(peaks.max()) if peaks.size else 0.0
+    if peak_max <= 0:
+        return bytes(n_bins)
+    q = np.clip(np.round(peaks / peak_max * levels), 0, levels).astype(np.uint8)
+    return q.tobytes()
+
+
+def extract_waveform_envelope(path: Path) -> dict[str, bytes]:
+    """Return the two byte streams a PWAV + PWV3 pair needs.
+
+    Output:
+        {
+            "preview": bytes of length PREVIEW_COLS (always 400),
+            "scroll":  bytes of length ~ duration * SCROLL_FPS,
+        }
+    On decode failure both streams are empty.
+    """
+    samples = _decode_pcm(path)
+    if samples.size == 0:
+        return {"preview": b"", "scroll": b""}
+    duration = samples.size / SAMPLE_RATE
+    scroll_cols = max(1, int(round(duration * SCROLL_FPS)))
+    return {
+        "preview": _bin_amplitudes(samples, PREVIEW_COLS),
+        "scroll": _bin_amplitudes(samples, scroll_cols),
+    }
+
+
+def _detect_beats_in_samples(samples: np.ndarray) -> list[float]:
+    """Run aubio's onset detector across a pre-loaded mono PCM buffer.
+
+    Returns the timestamps (seconds) of every detected beat.
+    """
+    tempo = aubio.tempo("default", WIN_SIZE, HOP_SIZE, SAMPLE_RATE)
+    beats: list[float] = []
+    for i in range(0, len(samples), HOP_SIZE):
+        chunk = samples[i:i + HOP_SIZE]
+        if len(chunk) < HOP_SIZE:
+            chunk = np.concatenate(
+                [chunk, np.zeros(HOP_SIZE - len(chunk), dtype=np.float32)]
+            )
+        if tempo(chunk):
+            beats.append(tempo.get_last_s())
+    return beats
+
+
+def _project_beat_grid(beats: list[float], bpm: float, duration_s: float) -> list[tuple[int, int, int]]:
+    """Project a rigid `bpm` beat grid using the first detected beat as anchor.
+
+    Returns `[(beat_number 1-4, tempo*100, time_ms), ...]` covering t=0 to
+    `duration_s`. Rigid grids are what CDJs prefer over noisy per-beat
+    timing — the strongest detected beat fixes the phase and we project
+    forward + backward at the canonical tempo.
+    """
+    if not beats or bpm <= 0:
+        return []
+    interval = 60.0 / bpm
+    first = beats[0]
+    # Walk back from the first detected beat to t≥0 so the grid covers the intro.
+    n_before = int(first / interval)
+    anchor = first - n_before * interval
+    if anchor < 0:
+        anchor += interval
+        n_before -= 1
+    tempo_x100 = round(bpm * 100)
+    grid: list[tuple[int, int, int]] = []
+    t = anchor
+    i = 0
+    while t <= duration_s + 1.0:
+        time_ms = int(round(t * 1000))
+        beat_number = (i % 4) + 1
+        grid.append((beat_number, tempo_x100, time_ms))
+        i += 1
+        t = anchor + i * interval
+    return grid
+
+
+CACHE_VERSION = 1
+
+
+def _sanitise_isrc(isrc: str) -> str:
+    """Reduce an ISRC to a filename-safe form (uppercase, alnum only)."""
+    return "".join(c for c in (isrc or "").upper() if c.isalnum())
+
+
+def cache_path_for(cache_dir: Path, isrc: str) -> Path | None:
+    """Return the path the cache file for `isrc` lives at, or None if no isrc."""
+    s = _sanitise_isrc(isrc)
+    if not s:
+        return None
+    return cache_dir / f"{s}.json"
+
+
+def save_analysis(cache_dir: Path, isrc: str, analysis: dict) -> Path | None:
+    """Persist `analysis` for `isrc` under `cache_dir`. No-op if isrc empty."""
+    target = cache_path_for(cache_dir, isrc)
+    if target is None:
+        return None
+    target.parent.mkdir(parents=True, exist_ok=True)
+    payload = {
+        "version": CACHE_VERSION,
+        "isrc": _sanitise_isrc(isrc),
+        "bpm": analysis.get("bpm"),
+        "beats": analysis.get("beats", []),
+        "preview_b64": b64encode(analysis.get("preview") or b"").decode("ascii"),
+        "scroll_b64": b64encode(analysis.get("scroll") or b"").decode("ascii"),
+    }
+    target.write_text(json.dumps(payload, separators=(",", ":")))
+    return target
+
+
+def load_analysis(cache_dir: Path, isrc: str) -> dict | None:
+    """Return cached analysis for `isrc`, or None if absent/stale/unreadable."""
+    target = cache_path_for(cache_dir, isrc)
+    if target is None or not target.exists():
+        return None
+    try:
+        d = json.loads(target.read_text())
+        if d.get("version") != CACHE_VERSION:
+            return None
+        return {
+            "bpm": d.get("bpm"),
+            # JSON tuples come back as lists; PQTZ writer accepts either.
+            "beats": [tuple(b) for b in d.get("beats", [])],
+            "preview": b64decode(d.get("preview_b64") or ""),
+            "scroll": b64decode(d.get("scroll_b64") or ""),
+        }
+    except (json.JSONDecodeError, OSError, ValueError) as e:
+        logger.warning("analysis cache read failed for {}: {}", isrc, e)
+        return None
+
+
+def analyze_audio(path: Path) -> dict:
+    """One-pass decode + analysis. Returns:
+        {
+            "bpm":     float | None,   # median-of-intervals tempo
+            "beats":   list[(beat_n, tempo_x100, time_ms)],  # for PQTZ
+            "preview": bytes,          # for PWAV (400-byte amplitude strip)
+            "scroll":  bytes,          # for PWV3 (~150 cols/sec)
+        }
+    """
+    samples = _decode_pcm(path)
+    out: dict = {"bpm": None, "beats": [], "preview": b"", "scroll": b""}
+    if samples.size == 0:
+        return out
+
+    # Beat onsets.
+    beat_times = _detect_beats_in_samples(samples)
+    if len(beat_times) >= MIN_BEATS:
+        intervals = pl.Series(
+            [beat_times[i + 1] - beat_times[i] for i in range(len(beat_times) - 1)]
+        )
+        median_interval = intervals.median()
+        if median_interval and median_interval > 0:
+            out["bpm"] = 60.0 / median_interval
+            duration_s = samples.size / SAMPLE_RATE
+            out["beats"] = _project_beat_grid(beat_times, out["bpm"], duration_s)
+
+    # Waveform envelopes.
+    duration = samples.size / SAMPLE_RATE
+    scroll_cols = max(1, int(round(duration * SCROLL_FPS)))
+    out["preview"] = _bin_amplitudes(samples, PREVIEW_COLS)
+    out["scroll"] = _bin_amplitudes(samples, scroll_cols)
+    return out

maple-py/src/maple/anlz.py

@@ -1,41 +1,260 @@
-"""Generate a minimal rekordbox ANLZ0000.DAT analysis file.
+"""Generate a rekordbox ANLZ0000.{DAT,EXT} pair.
 
-The CDJ/XDJ reads the path from a `PPTH` section to confirm which audio
+ANLZ0000.DAT — what CDJ-900-era through CDJ-3000 firmware reads to display
-file the analysis applies to. We emit just that section -- no beat grid,
+the loaded-deck BPM, the touch-strip preview waveform, and the cue list:
-no waveforms -- which is enough for the player to consider the track's
+
-analysis "present" and surface the track in the library. Without an
+    PPTH  player-relative audio path
-analyze file at the path the pdb references, some firmware hides the
+    PVBR  variable-bitrate seek index (zero-filled placeholder; matches the
-track entirely.
+          shape rekordbox writes for files where the seek index isn't useful)
+    PQTZ  beat grid (per-beat: beat_number, tempo*100, time_ms)
+    PWAV  400-byte blue/white touch-strip preview
+    PWV2  100-byte "tiny" overview waveform
+    PCOB  memory-cue list (empty placeholder)
+    PCOB  hot-cue list (empty placeholder)
+
+ANLZ0000.EXT — extended data; we write a minimal PPTH-only file so newer
+firmware that opens .EXT as part of its load flow finds a valid container.
+Color / 3-band waveforms (PWV4/PWV5/PWV6/PWV7) belong in .EXT/.2EX and
+aren't generated yet.
+
+Field discoveries documented by byte-diffing maple's output against a real
+rekordbox export at data/q1-rekordbox/.
 
 All multi-byte fields in ANLZ files are BIG-endian, unlike the pdb.
 """
+from __future__ import annotations
+
 from pathlib import Path
 from struct import pack
 
+from loguru import logger
+
+from maple.analyze import analyze_audio, load_analysis, save_analysis
+
+# Real rekordbox PMAI header carries three non-zero u4 markers in the bytes
+# after the standard PMAI/len_header/len_file triple. Verified by hex-dump
+# of data/q1-rekordbox/PIONEER/USBANLZ/P020/0002E10A/ANLZ0000.{DAT,EXT,2EX}
+# — all three files share the same 16-byte trailer.
+PMAI_HEADER_TRAILER = pack(">IIII", 0x00000001, 0x00010000, 0x00010000, 0x00000000)
+ANLZ_HEADER_LEN = 28  # PMAI + 2 size u4s + the 16-byte trailer above
+
 
 def _section_pth(path: str) -> bytes:
     """PPTH section: u4 len_path, then UTF-16BE bytes (null-terminated)."""
     utf16 = path.encode("utf-16-be") + b"\x00\x00"
     len_path = len(utf16)
     body = pack(">I", len_path) + utf16
-    # Section header: 4 fourcc + u4 len_header + u4 len_tag
     fourcc = b"PPTH"
-    len_header = 16            # section header size (incl. fourcc + 2 u4s + len_path u4)
+    len_header = 16            # fourcc + 2 u4 size fields + len_path u4
-    len_tag = 12 + len(body)   # full section size
+    len_tag = 12 + len(body)
     return fourcc + pack(">II", len_header, len_tag) + body
 
 
-def build_minimal_anlz(audio_path: str) -> bytes:
+def _section_pvbr() -> bytes:
-    """Return bytes of a minimal ANLZ0000.DAT pointing at `audio_path`."""
+    """PVBR section: 400-entry VBR seek index. We write a zero-filled
-    pth = _section_pth(audio_path)
+    placeholder — rekordbox accepts this for fixed-bitrate sources and it
-    header_len = 28
+    matches the section's presence in real exports."""
-    file_len = header_len + len(pth)
+    fourcc = b"PVBR"
-    header = b"PMAI" + pack(">II", header_len, file_len)
+    len_header = 16            # prelude(12) + u4 unnamed0(4)
-    header += b"\x00" * (header_len - len(header))
+    # 400 u4 seek index + 4 trailer bytes = 1604 bytes of variable data
-    assert len(header) == header_len
+    # (verified by len_tag=1620 in the real Q1.1 export).
-    return header + pth
+    body_var = b"\x00" * 1604
+    unnamed0 = b"\x00\x00\x00\x00"
+    len_tag = len_header + len(body_var)  # 16 + 1604 = 1620
+    return fourcc + pack(">II", len_header, len_tag) + unnamed0 + body_var
 
 
-def write_anlz(audio_path: str, dest: Path) -> None:
+def _section_pqtz(beats: list[tuple[int, int, int]]) -> bytes:
+    """PQTZ: BeatGridTag — per-beat (beat_number, tempo×100, time_ms).
+
+    The CDJ's loaded-deck BPM readout, tempo slider and sync engine all
+    read from this section. Real rekordbox sets `_unnamed1=0x00080000`
+    (was 0 in maple's earlier writer — likely the cause of the deck-side
+    BPM display staying blank even when the grid was otherwise valid).
+    """
+    fourcc = b"PQTZ"
+    len_header = 24            # prelude(12) + 3 u4 body-header fields
+    num_beats = len(beats)
+    body = pack(">III", 0x00000000, 0x00080000, num_beats)
+    for bn, tempo_x100, t_ms in beats:
+        body += pack(">HHI", bn, tempo_x100, t_ms)
+    len_tag = 12 + len(body)
+    return fourcc + pack(">II", len_header, len_tag) + body
+
+
+def _section_pwav(preview: bytes) -> bytes:
+    """PWAV: WavePreviewTag — 400-byte blue/white touch-strip preview.
+    Each byte = (white_flag << 5) | height (bits 0-4)."""
+    fourcc = b"PWAV"
+    len_header = 20            # prelude(12) + len_data(4) + _unnamed1(4)
+    len_tag = len_header + len(preview)
+    return fourcc + pack(">IIII", len_header, len_tag, len(preview), 0x00010000) + preview
+
+
+def _section_pwv2(tiny: bytes) -> bytes:
+    """PWV2: 100-byte "tiny" overview waveform. Same byte encoding as PWAV,
+    just at a coarser resolution. Real Q1.1 export has this section."""
+    fourcc = b"PWV2"
+    len_header = 20            # prelude(12) + len_data(4) + _unnamed1(4)
+    len_tag = len_header + len(tiny)
+    return fourcc + pack(">IIII", len_header, len_tag, len(tiny), 0x00010000) + tiny
+
+
+def _section_pcob(cue_list_type: int) -> bytes:
+    """PCOB: CueTag — cue/loop list. Real exports always include both
+    memory-cue (type=0) and hot-cue (type=1) sections, even when both are
+    empty. Body: u4 type, 2 bytes unnamed, u2 num_cues, u4 memory_count."""
+    fourcc = b"PCOB"
+    len_header = 24            # prelude(12) + body fixed prefix(12)
+    body = pack(">I", cue_list_type) + b"\x00\x00" + pack(">HI", 0, 0)
+    len_tag = 12 + len(body)
+    return fourcc + pack(">II", len_header, len_tag) + body
+
+
+def _section_pwv3(scroll: bytes) -> bytes:
+    """PWV3: WaveScrollTag — full-track mono scroll waveform.
+
+    NOT written into ANLZ0000.DAT (real rekordbox places PWV3 in .EXT, not
+    .DAT). Kept here for reference / future .EXT generation."""
+    fourcc = b"PWV3"
+    len_header = 24
+    len_entry_bytes = 1
+    len_entries = len(scroll)
+    len_tag = len_header + len(scroll)
+    return fourcc + pack(">IIIII", len_header, len_tag, len_entry_bytes, len_entries, 0x00960000) + scroll
+
+
+def _bin_tiny_from_preview(preview: bytes, cols: int = 100) -> bytes:
+    """Derive the PWV2 tiny envelope from PWAV's 400-byte preview by
+    re-binning groups of 4 columns to their per-bin max."""
+    if not preview:
+        return b""
+    chunk = max(1, len(preview) // cols)
+    out = bytearray(cols)
+    for i in range(cols):
+        slc = preview[i * chunk : (i + 1) * chunk] if i < cols - 1 else preview[i * chunk:]
+        if slc:
+            # Per-byte max ignoring the white-flag bit, then put it back at
+            # the corresponding compressed amplitude.
+            heights = [b & 0x1F for b in slc]
+            out[i] = max(heights) & 0x1F
+    return bytes(out)
+
+
+def _pmai_header(file_len: int) -> bytes:
+    """28-byte PMAI header — fourcc + sizes + the canonical trailer that
+    rekordbox writes (was zero-padded in maple's earlier output)."""
+    return b"PMAI" + pack(">II", ANLZ_HEADER_LEN, file_len) + PMAI_HEADER_TRAILER
+
+
+def build_dat(rb_path: str, analysis: dict | None) -> bytes:
+    """Build ANLZ0000.DAT — the file every CDJ reads on track load.
+
+    Section order matches rekordbox's own output: PPTH, PVBR, PQTZ, PWAV,
+    PWV2, PCOB(memory), PCOB(hot).
+    """
+    sections = [_section_pth(rb_path), _section_pvbr()]
+    if analysis:
+        if analysis.get("beats"):
+            sections.append(_section_pqtz(analysis["beats"]))
+        preview = analysis.get("preview") or b""
+        if preview:
+            sections.append(_section_pwav(preview))
+            sections.append(_section_pwv2(_bin_tiny_from_preview(preview)))
+    sections.append(_section_pcob(0))   # memory cues (empty)
+    sections.append(_section_pcob(1))   # hot cues (empty)
+    body = b"".join(sections)
+    return _pmai_header(ANLZ_HEADER_LEN + len(body)) + body
+
+
+def build_ext(rb_path: str) -> bytes:
+    """Build a minimal ANLZ0000.EXT — PPTH-only.
+
+    Real rekordbox .EXT carries color waveforms and song-structure
+    sections; we don't generate those yet. A bare .EXT file is enough for
+    firmware that opens it as part of the standard track-load flow."""
+    body = _section_pth(rb_path)
+    return _pmai_header(ANLZ_HEADER_LEN + len(body)) + body
+
+
+def build_anlz(rb_path: str, source_audio: Path | None = None) -> bytes:
+    """Compatibility wrapper for callers that want the .DAT bytes only."""
+    analysis: dict | None = None
+    if source_audio is not None:
+        try:
+            analysis = analyze_audio(source_audio)
+        except Exception as e:
+            logger.warning("audio analysis failed for {}: {}", source_audio.name, e)
+    return build_dat(rb_path, analysis)
+
+
+def build_minimal_anlz(rb_path: str) -> bytes:
+    """PPTH-only-plus-empties-DAT. Used when no source audio is available."""
+    return build_dat(rb_path, analysis=None)
+
+
+def _isrc_for(path: Path) -> str | None:
+    """Best-effort ISRC read from a file tag (mp3/flac/m4a)."""
+    try:
+        from mutagen import File as MutagenFile
+        audio = MutagenFile(path, easy=True)
+        if audio is None or audio.tags is None:
+            return None
+        v = audio.tags.get("isrc")
+        if not v:
+            return None
+        return str(v[0]).strip() or None
+    except Exception:
+        return None
+
+
+def write_anlz(
+    rb_path: str,
+    dest: Path,
+    source_audio: Path | None = None,
+    analysis_cache_dir: Path | None = None,
+) -> dict | None:
+    """Write ANLZ0000.DAT (and a minimal ANLZ0000.EXT alongside).
+
+    `dest` is the .DAT path. The .EXT companion is written next to it
+    automatically — every real CDJ export ships both files.
+
+    Returns the analysis dict (cache hit or fresh aubio run) or None when
+    no source audio was given.
+    """
     dest.parent.mkdir(parents=True, exist_ok=True)
-    dest.write_bytes(build_minimal_anlz(audio_path))
+    analysis: dict | None = None
+    cache_hit = False
+    if source_audio is not None:
+        isrc = _isrc_for(source_audio) if analysis_cache_dir else None
+        if isrc and analysis_cache_dir:
+            cached = load_analysis(analysis_cache_dir, isrc)
+            if cached is not None:
+                analysis = cached
+                cache_hit = True
+                logger.info("anlz: cache hit for {} (isrc {})", source_audio.name, isrc)
+        if analysis is None:
+            try:
+                analysis = analyze_audio(source_audio)
+            except Exception as e:
+                logger.warning("audio analysis failed for {}: {}", source_audio.name, e)
+                analysis = None
+        # Populate the cache on every successful fresh analysis so subsequent
+        # exports (and collection runs) can skip the ffmpeg+aubio pass. The
+        # cache is the single source of truth — populated by whichever
+        # pipeline (`just collection` or `just export`) sees a track first.
+        if analysis is not None and not cache_hit and analysis_cache_dir is not None and isrc:
+            try:
+                cp = save_analysis(analysis_cache_dir, isrc, analysis)
+                if cp is not None:
+                    logger.info("anlz: cached analysis for {} → {}", source_audio.name, cp)
+            except Exception as e:
+                logger.warning("could not write analysis cache for {}: {}", source_audio.name, e)
+
+    dest.write_bytes(build_dat(rb_path, analysis))
+    # .EXT sister file. Newer firmware (esp. CDJ-3000) opens this during the
+    # track-load flow; absence of the file has been observed to silently
+    # disable the loaded-deck BPM/waveform display even when .DAT is intact.
+    ext_path = dest.with_suffix(".EXT")
+    ext_path.write_bytes(build_ext(rb_path))
+    return analysis

maple-py/src/maple/cli.py

@@ -1,34 +1,116 @@
 """maple CLI: scan a directory of audio + m3u8 playlists and build a rekordbox USB."""
 import argparse
 import os
+import re
 import sys
+import time
+from collections import defaultdict
 from concurrent.futures import ThreadPoolExecutor
 from datetime import date
 from pathlib import Path
 
+from loguru import logger
+
 from maple.anlz import write_anlz
+from maple.artwork import _bucket as _artwork_bucket
 from maple.artwork import extract_artwork
 from maple.convert import convert_flac_to_mp3, verify_duration
 from maple.copy import stage_audio, staged_path
+from maple.log import configure as configure_logging
 from maple.meta import read_tags
 from maple.model import Album, Artist, Artwork, Database, Genre, PlaylistEntry, PlaylistNode, Track
+from maple.enrich import enrich_from_manifest, load_spotify_manifest, write_bpm_tag
 from maple.pdb.writer import write_pdb
 from maple.scan import scan_audio, scan_playlists
+from maple.validate import TrackIssue, log_issues, validate_track
+
+# Genre tag delimiters seen across our sources: Spotify-derived uses
+# ';', European labels often use ',', some store '/'-separated lists.
+_GENRE_SPLIT_RE = re.compile(r"\s*[;,/]\s*")
 
 
-def build(input_dir: Path, usb_root: Path, with_playlists: bool = True) -> Database:
+def split_genre_tags(raw: str) -> list[str]:
+    """Tokenise a possibly multi-value genre string into normalised parts.
+
+    Each token's casing is preserved as-given. Empty parts are dropped.
+    Duplicates within the same source string are collapsed (first wins).
+    """
+    if not raw:
+        return []
+    seen: set[str] = set()
+    out: list[str] = []
+    for token in _GENRE_SPLIT_RE.split(raw):
+        t = token.strip()
+        if not t:
+            continue
+        key = t.casefold()
+        if key in seen:
+            continue
+        seen.add(key)
+        out.append(t)
+    return out
+
+
+def build(input_dir: Path, usb_root: Path, with_playlists: bool = True) -> tuple[Database, set[Path]]:
+    """Build the rekordbox USB layout under `usb_root`.
+
+    Returns the populated `Database` plus the set of absolute paths that
+    were written (audio files, ANLZ files, artwork JPEGs). The caller adds
+    the pdb path and calls `prune_stale` to remove anything else under
+    `usb_root` left over from a previous export.
+    """
     db = Database()
     today = date.today().isoformat()
 
     artist_index: dict[str, int] = {}
     album_index: dict[tuple[int, str], int] = {}
+    # Key by casefolded name so "Dub Techno" and "dub techno" collapse to one row.
     genre_index: dict[str, int] = {}
+    # The user-facing genre→tracks map. Populated as tracks are processed.
+    genre_to_tracks: dict[str, list[int]] = defaultdict(list)
     track_by_src: dict[Path, int] = {}
     artwork_cache: dict[str, int] = {}
+    written: set[Path] = set()
 
     audio_files = scan_audio(input_dir)
+    logger.info("scanned {}: {} audio file(s)", input_dir, len(audio_files))
 
+    # ---------- Spotify enrichment (symmetric with `just collection`) -------- #
+    # Per the validation convention: both pipelines must be capable of
+    # bringing a track to "valid" state. Validate first; only files that
+    # actually need it pay the enrichment cost (mutagen tag rewrite +
+    # possible artwork fetch). Repeated exports of an already-valid
+    # collection skip the enrichment loop entirely.
+    by_key, by_isrc = load_spotify_manifest(input_dir / "_metadata")
+    cache_dir = input_dir / "_analysis"
+    if by_key or by_isrc:
+        logger.info(
+            "loaded spotify manifest: {} (artist,title) keys, {} ISRCs",
+            len(by_key), len(by_isrc),
+        )
+        enriched = 0
+        skipped = 0
+        for p in audio_files:
+            if not validate_track(p, analysis_cache_dir=cache_dir):
+                skipped += 1
+                continue
+            if enrich_from_manifest(p, by_key, by_isrc, analysis_cache_dir=cache_dir) is not None:
+                enriched += 1
+        logger.info(
+            "enrichment: {} enriched, {} already valid (skipped)",
+            enriched, skipped,
+        )
+    else:
+        logger.warning(
+            "no spotify manifest at {} — tracks won't be Spotify-enriched. "
+            "Run `just collection` first to fetch + persist the manifest.",
+            input_dir / "_metadata" / "spotify-tracks.json",
+        )
+
+    t = time.perf_counter()
     initial_meta = {p: read_tags(p) for p in audio_files}
+    logger.debug("read tags in {:.2f}s", time.perf_counter() - t)
+
     flac_jobs: list[tuple[Path, Path]] = []
     for original in audio_files:
         if original.suffix.lower() == ".flac":
@@ -38,15 +120,32 @@ def build(input_dir: Path, usb_root: Path, with_playlists: bool = True) -> Datab
 
     def _job(pair: tuple[Path, Path]) -> tuple[Path, Path, bool]:
         src, dst = pair
-        return src, dst, convert_flac_to_mp3(src, dst)
+        t0 = time.perf_counter()
+        converted = convert_flac_to_mp3(src, dst)
+        return src, dst, converted, time.perf_counter() - t0
 
-    workers = max(1, os.cpu_count() or 1)
+    if flac_jobs:
-    with ThreadPoolExecutor(max_workers=workers) as ex:
+        workers = max(1, os.cpu_count() or 1)
-        for src, dst, converted in ex.map(_job, flac_jobs):
+        logger.info("converting {} flac(s) → mp3 v0 (workers={})", len(flac_jobs), workers)
-            print(f"{'convert' if converted else 'cached '} {src.relative_to(input_dir)}")
+        t = time.perf_counter()
-            verify_duration(src, dst)
+        n_converted = 0
+        with ThreadPoolExecutor(max_workers=workers) as ex:
+            for i, (src, dst, converted, dt) in enumerate(ex.map(_job, flac_jobs), 1):
+                tag = "convert" if converted else "cached "
+                logger.info("[{}/{}] {} {} ({:.1f}s)", i, len(flac_jobs), tag, src.relative_to(input_dir), dt)
+                if converted:
+                    n_converted += 1
+                verify_duration(src, dst)
+        logger.info(
+            "flac→mp3 pass: {} converted, {} cached in {:.1f}s total",
+            n_converted, len(flac_jobs) - n_converted, time.perf_counter() - t,
+        )
 
-    for original in audio_files:
+    logger.info("building track table ({} files)", len(audio_files))
+    build_t0 = time.perf_counter()
+    validation_issues: list[TrackIssue] = []
+    for track_idx, original in enumerate(audio_files, 1):
+        track_t0 = time.perf_counter()
         meta = initial_meta[original]
         artist_id = artist_index.get(meta.artist)
         if artist_id is None:
@@ -66,19 +165,50 @@ def build(input_dir: Path, usb_root: Path, with_playlists: bool = True) -> Datab
             meta = read_tags(dest_abs)
         else:
             dest_abs, file_path = stage_audio(original, usb_root, meta.artist, meta.album)
+        written.add(dest_abs.resolve())
+
+        # Re-enrich the STAGED file too — `stage_audio` and the FLAC→MP3
+        # converter cache by hash, so a cached dest may still carry stale
+        # tags from a previous export. Skip when the staged file already
+        # passes validation so re-exports of an unchanged collection don't
+        # re-mutate every track.
+        if (by_key or by_isrc) and validate_track(dest_abs, analysis_cache_dir=cache_dir):
+            if enrich_from_manifest(dest_abs, by_key, by_isrc, analysis_cache_dir=cache_dir) is not None:
+                meta = read_tags(dest_abs)
 
         next_artwork_id = len(db.artwork) + 1
         artwork_id, art_file_path = extract_artwork(dest_abs, usb_root, next_artwork_id, artwork_cache)
         if art_file_path is not None:
             db.artwork.append(Artwork(id=artwork_id, path=art_file_path))
+        # Track artwork paths for the prune sweep — both this run's writes
+        # and any artwork_cache hits (where extract_artwork returned None
+        # for art_file_path because the jpeg already exists from a prior
+        # iteration). _bucket() is the same id-to-folder mapping artwork.py
+        # uses, so this rebuilds the absolute on-disk path exactly.
+        if artwork_id:
+            art_bucket = _artwork_bucket(artwork_id)
+            for fname in (f"a{artwork_id}.jpg", f"a{artwork_id}_m.jpg"):
+                written.add((usb_root / "PIONEER" / "Artwork" / art_bucket / fname).resolve())
 
-        genre_id = 0
+        # Genre: split multi-value tag strings ("dub techno;minimal techno",
-        if meta.genre:
+        # "Drum & Bass, Électronique", etc.) into individual genre rows so the
-            genre_id = genre_index.get(meta.genre, 0)
+        # CDJ's Genre filter is usable. The track FK points at the FIRST
-            if genre_id == 0:
+        # (most-specific) token; every other token still gets its own row in
-                genre_id = len(db.genres) + 1
+        # the pdb's genre table so it appears in the browse list, and we
-                genre_index[meta.genre] = genre_id
+        # record the {genre→track_ids} map so we can log + reuse it later.
-                db.genres.append(Genre(id=genre_id, name=meta.genre))
+        primary_genre_id = 0
+        tokens = split_genre_tags(meta.genre)
+        for n, token in enumerate(tokens):
+            key = token.casefold()
+            gid = genre_index.get(key)
+            if gid is None:
+                gid = len(db.genres) + 1
+                genre_index[key] = gid
+                db.genres.append(Genre(id=gid, name=token))
+            if n == 0:
+                primary_genre_id = gid
+            genre_to_tracks[token].append(len(db.tracks) + 1)  # this track's id-to-be
+        genre_id = primary_genre_id
 
         track_id = len(db.tracks) + 1
         # Reference exports always populate analyze_path even when the
@@ -95,7 +225,29 @@ def build(input_dir: Path, usb_root: Path, with_playlists: bool = True) -> Datab
         bucket = f"P{(h >> 20) & 0x7F:02X}"
         analyze_id = f"{h & 0xFFFFFFFF:08X}"
         analyze_path = f"/PIONEER/USBANLZ/{bucket}/{analyze_id}/ANLZ0000.DAT"
-        write_anlz(file_path, usb_root / analyze_path.lstrip("/"))
+        anlz_abs = (usb_root / analyze_path.lstrip("/")).resolve()
+        # `_analysis/` sits at the input collection root; ISRC-keyed cache
+        # populated during `just collection`. write_anlz reads it before
+        # falling back to a fresh ffmpeg+aubio pass.
+        analysis = write_anlz(
+            file_path, anlz_abs, source_audio=dest_abs,
+            analysis_cache_dir=input_dir / "_analysis",
+        )
+        written.add(anlz_abs)
+        # .EXT sister file is written automatically next to the .DAT.
+        written.add(anlz_abs.with_suffix(".EXT"))
+        # Prefer the analytically detected BPM over the file tag when we have one.
+        # CDJ browse panel reads pdb.tempo; loaded-deck readout reads the PQTZ
+        # we just wrote — keeping the two in sync avoids the "120.0 in browse,
+        # blank on deck" UX bug.
+        if analysis and analysis.get("bpm"):
+            tempo_x100 = round(analysis["bpm"] * 100)
+            # Also write the bpm TAG to the file (symmetric with `just
+            # collection`'s _write_bpm_tag). overwrite=False so any
+            # pre-existing label-set BPM is preserved.
+            write_bpm_tag(dest_abs, analysis["bpm"], overwrite=False)
+        else:
+            tempo_x100 = meta.tempo
         db.tracks.append(Track(
             id=track_id,
             title=meta.title,
@@ -110,7 +262,7 @@ def build(input_dir: Path, usb_root: Path, with_playlists: bool = True) -> Datab
             duration=meta.duration,
             track_number=meta.track_number,
             year=meta.year,
-            tempo=meta.tempo,
+            tempo=tempo_x100,
             date_added=today,
             analyze_path=analyze_path,
             analyze_date=today,
@@ -120,9 +272,61 @@ def build(input_dir: Path, usb_root: Path, with_playlists: bool = True) -> Datab
         ))
         track_by_src[original.resolve()] = track_id
 
+        # Cross-cutting validation: same checks as `just collection`. The
+        # input audio_path is the staged file under data/usb/ so its tags
+        # are what end up on the player. analysis cache lives at the source
+        # collection root (input_dir/_analysis/<isrc>.json).
+        track_issues = validate_track(
+            dest_abs,
+            analysis_cache_dir=input_dir / "_analysis",
+        )
+        validation_issues.extend(track_issues)
+
+        track_dt = time.perf_counter() - track_t0
+        bpm_str = f"{analysis['bpm']:.1f} bpm" if (analysis and analysis.get("bpm")) else f"tag {tempo_x100/100:.1f} bpm"
+        issue_tag = f" [{len(track_issues)} issue(s)]" if track_issues else ""
+        logger.info(
+            "[{}/{}] {} - {}  ({}, {:.1f}s){}",
+            track_idx, len(audio_files),
+            meta.artist, meta.title,
+            bpm_str, track_dt, issue_tag,
+        )
+    logger.info(
+        "track table built in {:.1f}s ({} tracks, {} artists, {} albums, "
+        "{} artwork, {} genres)",
+        time.perf_counter() - build_t0,
+        len(db.tracks), len(db.artists), len(db.albums),
+        len(db.artwork), len(db.genres),
+    )
+    # Genre map summary: largest buckets first; helps spot mistagged tracks.
+    if genre_to_tracks:
+        logger.info("genre→tracks map ({} genres):", len(genre_to_tracks))
+        for genre, track_ids in sorted(
+            genre_to_tracks.items(), key=lambda kv: (-len(kv[1]), kv[0])
+        ):
+            logger.info("  {:<32s} {:>3} track(s)", genre[:32], len(track_ids))
+    no_genre = sum(1 for t in db.tracks if t.genre_id == 0)
+    if no_genre:
+        logger.warning("{} of {} tracks have no genre tag", no_genre, len(db.tracks))
+
+    # Emit the validation report. Same TrackIssue shape as `just collection`,
+    # surfaced through loguru so the user gets visibility plus a roll-up at
+    # the end.
+    if validation_issues:
+        logger.warning(
+            "{} validation issue(s) across {} track(s)",
+            len(validation_issues),
+            len({(i.artist, i.title) for i in validation_issues}),
+        )
+        log_issues(validation_issues, report=False)
+    else:
+        logger.info("validation: all {} tracks passed", len(audio_files))
+
     if not with_playlists:
-        return db
+        return db, written, validation_issues
     playlists = scan_playlists(input_dir)
+    if playlists:
+        logger.info("scanning {} playlist(s)", len(playlists))
     for sort_order, (name, paths) in enumerate(playlists.items(), start=1):
         playlist_id = len(db.playlist_nodes) + 1
         db.playlist_nodes.append(PlaylistNode(
@@ -132,18 +336,58 @@ def build(input_dir: Path, usb_root: Path, with_playlists: bool = True) -> Datab
             name=name,
             is_folder=False,
         ))
+        resolved = 0
         for entry_index, p in enumerate(paths, start=1):
             tid = track_by_src.get(p.resolve())
             if tid is None:
-                print(f"warning: playlist {name!r} references missing file {p}", file=sys.stderr)
+                logger.warning("playlist {!r} references missing file {}", name, p)
                 continue
             db.playlist_entries.append(PlaylistEntry(
                 playlist_id=playlist_id,
                 track_id=tid,
                 entry_index=entry_index,
             ))
+            resolved += 1
+        logger.info("  {}: {} entries ({} resolved, {} missing)",
+                    name, len(paths), resolved, len(paths) - resolved)
 
-    return db
+    return db, written, validation_issues
+
+
+def prune_stale(usb_root: Path, kept: set[Path]) -> tuple[int, int]:
+    """Delete every file under `usb_root` not in `kept`, then drop empty dirs.
+
+    Returns (files_removed, dirs_removed). Operates only under `usb_root`,
+    so anything outside is untouched. The `kept` set is expected to hold
+    fully-resolved absolute paths.
+    """
+    files_removed = 0
+    for p in usb_root.rglob("*"):
+        if not p.is_file():
+            continue
+        if p.resolve() in kept:
+            continue
+        try:
+            p.unlink()
+            files_removed += 1
+        except OSError as e:
+            logger.warning("failed to remove {}: {}", p, e)
+
+    # Bottom-up empty-dir removal: deepest first so each parent gets a
+    # chance to become empty once its children are gone.
+    dirs = sorted(
+        (d for d in usb_root.rglob("*") if d.is_dir()),
+        key=lambda d: len(d.parts),
+        reverse=True,
+    )
+    dirs_removed = 0
+    for d in dirs:
+        try:
+            d.rmdir()
+            dirs_removed += 1
+        except OSError:
+            pass  # not empty; expected for the directories we still want
+    return files_removed, dirs_removed
 
 
 def main(argv: list[str] | None = None) -> int:
@@ -151,16 +395,41 @@ def main(argv: list[str] | None = None) -> int:
     parser.add_argument("input_dir", nargs="?", type=Path, default=Path("./data/input"))
     parser.add_argument("output_root", nargs="?", type=Path, default=Path("./data/usb"))
     parser.add_argument("--no-playlists", action="store_true", help="Skip m3u8 playlist scanning")
+    parser.add_argument("--no-prune", action="store_true", help="Skip the post-build sweep of stale files")
+    parser.add_argument("--strict", action="store_true", help="Fail with non-zero exit if any track fails validation")
     args = parser.parse_args(argv)
 
+    configure_logging()
     if not args.input_dir.is_dir():
         parser.error(f"input_dir {args.input_dir} is not a directory")
 
-    db = build(args.input_dir, args.output_root, with_playlists=not args.no_playlists)
+    overall_t0 = time.perf_counter()
+    logger.info("export: {} → {}", args.input_dir, args.output_root)
+    db, written, validation_issues = build(args.input_dir, args.output_root, with_playlists=not args.no_playlists)
 
     pdb_path = args.output_root / "PIONEER" / "rekordbox" / "export.pdb"
     write_pdb(db, pdb_path)
+    written.add(pdb_path.resolve())
 
-    print(f"wrote {len(db.tracks)} tracks, {len(db.artists)} artists, {len(db.albums)} albums, "
+    if not args.no_prune:
-          f"{len(db.playlist_nodes)} playlists ({len(db.playlist_entries)} entries) to {pdb_path}")
+        t = time.perf_counter()
+        n_files, n_dirs = prune_stale(args.output_root, written)
+        if n_files or n_dirs:
+            logger.info(
+                "pruned {} stale file(s) + {} empty dir(s) in {:.1f}s",
+                n_files, n_dirs, time.perf_counter() - t,
+            )
+        else:
+            logger.debug("nothing to prune ({:.1f}s)", time.perf_counter() - t)
+
+    logger.info(
+        "done in {:.1f}s: {} tracks, {} artists, {} albums, "
+        "{} playlists ({} entries) → {}",
+        time.perf_counter() - overall_t0,
+        len(db.tracks), len(db.artists), len(db.albums),
+        len(db.playlist_nodes), len(db.playlist_entries), pdb_path,
+    )
+    if args.strict and validation_issues:
+        logger.error("--strict: refusing to succeed with {} validation issue(s)", len(validation_issues))
+        return 1
     return 0

maple-py/src/maple/collection/__init__.py

@@ -21,7 +21,18 @@ Env (from .env, loaded by just):
   MAPLE_SPOTIFY_CLIENT_ID, MAPLE_SPOTIFY_CLIENT_SECRET (spotify.py reads)
   SOCKSEEK_USER, SOCKSEEK_PASS (forwarded to sockseek)
 """
-from maple.collection.core import Collection, TrackIssue
+# Re-exports are lazy via __getattr__ so importing `maple.collection.index`
-from maple.collection.index import CollectionIndex
+# (or any other submodule) doesn't drag the whole package — `maple.validate`
-
+# depends on `maple.collection.index` and would otherwise circular-import
+# through `maple.collection.core` → `maple.validate` → here.
 __all__ = ["Collection", "CollectionIndex", "TrackIssue"]
+
+
+def __getattr__(name):
+    if name == "Collection" or name == "TrackIssue":
+        from maple.collection.core import Collection, TrackIssue
+        return {"Collection": Collection, "TrackIssue": TrackIssue}[name]
+    if name == "CollectionIndex":
+        from maple.collection.index import CollectionIndex
+        return CollectionIndex
+    raise AttributeError(name)

maple-py/src/maple/collection/cli.py

@@ -16,6 +16,7 @@ from loguru import logger
 
 from maple.collection.core import Collection, TrackIssue
 from maple.collection.index import first_artist, norm
+from maple.enrich import save_spotify_manifest
 from maple.log import configure as configure_logging
 from maple.spotify import fetch_playlists
 
@@ -55,6 +56,9 @@ async def main_async(argv: list[str]) -> int:
     playlists = await fetch_playlists(args.ids)
     total = sum(len(p["tracks"]) for p in playlists)
     logger.info("fetched {} playlist(s), {} tracks", len(playlists), total)
+    # Persist the full set of Spotify tracks so `just export` (and any
+    # later `just collection` run) can enrich tags without re-fetching.
+    save_spotify_manifest(collection.metadata_dir, playlists)
 
     collection.refresh_index()
     logger.info(

maple-py/src/maple/collection/core.py

@@ -23,6 +23,10 @@ import aiohttp
 from loguru import logger
 from mutagen import File as MutagenFile
 
+from maple.analyze import analyze_audio, detect_bpm, save_analysis
+from maple.enrich import write_spotify_tags as _shared_write_spotify_tags
+from maple.validate import TrackIssue as _ValidateTrackIssue
+from maple.validate import validate_track as _validate_track
 from maple.collection.index import (
     CollectionIndex,
     first_artist,
@@ -42,13 +46,14 @@ from maple.collection.validate import (
 )
 from maple.scan import AUDIO_EXTS
 
+BPM_DIVERGENCE_WARN = 0.05  # warn when aubio vs existing tag differs >5%
 
-@dataclass
+
-class TrackIssue:
+# Re-export the shared validator's TrackIssue so callers that imported it
-    playlist: str
+# from maple.collection.core continue to work. There is one TrackIssue
-    artist: str
+# definition in the codebase — `maple.validate.TrackIssue` — and both the
-    title: str
+# `just collection` and `just export` flows produce/consume the same shape.
-    reason: str
+TrackIssue = _ValidateTrackIssue
 
 
 _M3U_BAD = re.compile(r"[\\/\x00]+")
@@ -95,10 +100,17 @@ class Collection:
     def report_path(self) -> Path:
         return self.metadata_dir / "collection-report.txt"
 
+    @property
+    def analysis_dir(self) -> Path:
+        """`<root>/_analysis/<isrc>.json` — cached aubio output keyed on ISRC,
+        consumed by `just export` to skip the decode+detect pass."""
+        return self.root / "_analysis"
+
     def ensure_dirs(self) -> None:
         self.root.mkdir(parents=True, exist_ok=True)
         self.metadata_dir.mkdir(parents=True, exist_ok=True)
         self.playlists_dir.mkdir(parents=True, exist_ok=True)
+        self.analysis_dir.mkdir(parents=True, exist_ok=True)
 
     # --- startup validation ----------------------------------------------- #
 
@@ -405,58 +417,38 @@ class Collection:
         return issues
 
     def write_spotify_tags(self, track: dict, path: Path) -> None:
-        """Overwrite the file's tags with the Spotify values.
+        """Delegate to the shared `maple.enrich.write_spotify_tags` so the
+        collection-side and export-side writes are byte-for-byte identical
+        and can't drift."""
+        _shared_write_spotify_tags(track, path)
 
-        Spotify is canonical: title, artist (joined ", "), album, date,
+    def _existing_bpm(self, path: Path) -> float | None:
-        genre(s), and ISRC are written. Missing Spotify values leave the
+        """Return the parsed `bpm` tag value, or None if absent/invalid."""
-        existing tag untouched.
-        """
         try:
             audio = MutagenFile(path, easy=True)
-        except Exception as e:
+            if audio is None or audio.tags is None:
-            logger.warning("write_spotify_tags: cannot open {}: {}", path.name, e)
+                return None
-            return
+            v = audio.tags.get("bpm")
-        if audio is None:
+            if not v:
-            return
+                return None
-        if audio.tags is None:
+            return float(v[0])
-            try:
+        except (ValueError, TypeError, Exception):
-                audio.add_tags()
+            return None
-            except Exception as e:
-                logger.warning("write_spotify_tags: cannot init tags on {}: {}", path.name, e)
-                return
-
-        title = (track.get("title") or "").strip()
-        if title:
-            audio.tags["title"] = title
-        artists = track.get("artists") or []
-        if artists:
-            audio.tags["artist"] = ", ".join(artists)
-        album = (track.get("album") or "").strip()
-        if album:
-            audio.tags["album"] = album
-        date = (track.get("release_date") or "").strip()
-        if date:
-            try:
-                audio.tags["date"] = date
-            except (KeyError, ValueError) as e:
-                logger.debug("date tag write skipped on {}: {}", path.name, e)
-        genres = track.get("genres") or []
-        if genres:
-            try:
-                audio.tags["genre"] = list(genres)
-            except (KeyError, ValueError) as e:
-                logger.debug("genre tag write skipped on {}: {}", path.name, e)
-        isrc = (track.get("isrc") or "").strip()
-        if isrc:
-            try:
-                audio.tags["isrc"] = isrc
-            except (KeyError, ValueError) as e:
-                logger.debug("isrc tag write skipped on {}: {}", path.name, e)
 
+    def _write_bpm_tag(self, path: Path, bpm: float) -> None:
         try:
+            audio = MutagenFile(path, easy=True)
+            if audio is None:
+                return
+            if audio.tags is None:
+                try:
+                    audio.add_tags()
+                except Exception:
+                    return
+            audio.tags["bpm"] = f"{bpm:.2f}"
             audio.save()
         except Exception as e:
-            logger.warning("write_spotify_tags: save failed for {}: {}", path.name, e)
+            logger.warning("failed to write bpm to {}: {}", path.name, e)
 
     def process_track(
         self,
@@ -464,12 +456,14 @@ class Collection:
         track: dict,
         path: Path,
     ) -> list[TrackIssue]:
-        """Reconcile a single downloaded file against Spotify.
+        """Reconcile a single downloaded file against Spotify + analyse it.
 
         Steps:
           1. ffprobe sanity check (one issue + early return on failure).
           2. Compare every relevant field; collect mismatch issues.
           3. Write Spotify's values back into the file's tags.
+          4. If the file has no `bpm` tag yet, run aubio BPM detection
+             and write the analytical value. Existing tags are left alone.
 
         Idempotent within a run — paths already processed are no-ops.
         """
@@ -477,14 +471,49 @@ class Collection:
             return []
         self._reconciled.add(path)
 
-        sp_artist = ", ".join(track.get("artists") or [])
+        # Source-of-truth tag writes first: ensures the file mirrors Spotify
-        sp_title = track.get("title") or ""
+        # before validation reads its tags back. Mismatches caught here are
-        if not ffprobe_ok(path):
+        # written to the report regardless of the validator's subsequent
-            return [TrackIssue(playlist_name, sp_artist, sp_title, f"ffprobe failed: {path}")]
+        # findings (the validator may dedup them if Spotify still disagrees).
-
-        issues = self.compare_against_spotify(playlist_name, track, path)
         self.write_spotify_tags(track, path)
-        return issues
+
+        # Single audio analysis pass: BPM + beat grid + waveform envelopes.
+        # Cached under collection/_analysis/<isrc>.json so `just export`
+        # reads the bytes back instead of redoing ffmpeg+aubio.
+        isrc = (track.get("isrc") or "").strip()
+        existing_bpm = self._existing_bpm(path)
+        try:
+            analysis = analyze_audio(path)
+        except Exception as e:
+            logger.warning("analyze_audio failed on {}: {}", path.name, e)
+            analysis = None
+        if analysis and analysis.get("bpm"):
+            if existing_bpm is None:
+                self._write_bpm_tag(path, analysis["bpm"])
+                logger.info("{}: bpm {:.2f} (aubio)", path.name, analysis["bpm"])
+            else:
+                logger.debug(
+                    "{}: bpm {:.2f} (existing tag, kept; aubio measured {:.2f})",
+                    path.name, existing_bpm, analysis["bpm"],
+                )
+            if isrc:
+                cp = save_analysis(self.analysis_dir, isrc, analysis)
+                logger.info("cached analysis for {}: {} → {}", isrc, path.name, cp)
+            else:
+                logger.warning(
+                    "skipping analysis cache for {}: no ISRC in spotify track ({} - {})",
+                    path.name, ", ".join(track.get("artists") or []), track.get("title") or "?",
+                )
+
+        # Full cross-cutting validation pass. Runs the SAME checks as
+        # `just export`, so a clean run here means the track will export
+        # without issues — and vice versa.
+        return _validate_track(
+            path,
+            spotify_track=track,
+            analysis_cache_dir=self.analysis_dir,
+            playlist=playlist_name,
+        )
 
     # --- validation -------------------------------------------------------- #
 

maple-py/src/maple/enrich.py

@@ -0,0 +1,307 @@
+"""Spotify metadata enrichment shared by `just collection` and `just export`.
+
+Per the project convention: a track is "valid" iff every export criterion
+holds (artwork, tags, analysis). BOTH pipelines must be capable of
+*bringing* a track to that state — validation isn't just reporting,
+it's repair.
+
+`just collection`:
+  1. Fetches Spotify playlists.
+  2. Persists every track to `<collection>/_metadata/spotify-tracks.json`.
+  3. Walks the collection, calls `write_spotify_tags` for each match.
+
+`just export`:
+  1. Loads the manifest written by `just collection`.
+  2. Walks `data/usb/`'s staged files. For any file missing canonical
+     tags (typically ISRC), looks up its Spotify entry via the manifest
+     and calls `write_spotify_tags` BEFORE validation runs.
+
+The shared write function lives here so the two pipelines are
+byte-for-byte consistent in what they leave on disk.
+"""
+from __future__ import annotations
+
+import json
+from pathlib import Path
+
+from loguru import logger
+from mutagen import File as MutagenFile
+from mutagen.flac import FLAC, Picture
+from mutagen.id3 import APIC, ID3, ID3NoHeaderError
+from mutagen.mp4 import MP4, MP4Cover
+
+from maple.collection.index import first_artist, norm
+from maple.collection.validate import embed_art, has_embedded_art
+
+MANIFEST_NAME = "spotify-tracks.json"
+
+
+# --------------------------------------------------------------------------- #
+# Manifest persistence                                                        #
+# --------------------------------------------------------------------------- #
+
+
+def save_spotify_manifest(metadata_dir: Path, playlists: list[dict]) -> Path:
+    """Persist Spotify-fetched playlists so `just export` can read them later.
+
+    Stored as a single JSON blob at `<metadata_dir>/spotify-tracks.json`.
+    Replaces any prior manifest atomically (tmp + rename).
+    """
+    metadata_dir.mkdir(parents=True, exist_ok=True)
+    target = metadata_dir / MANIFEST_NAME
+    tmp = target.with_suffix(target.suffix + ".tmp")
+    tmp.write_text(
+        json.dumps({"playlists": playlists}, indent=2, ensure_ascii=False, default=str)
+    )
+    tmp.replace(target)
+    n = sum(len(p.get("tracks") or []) for p in playlists)
+    logger.info("wrote spotify manifest: {} tracks across {} playlist(s) → {}",
+                n, len(playlists), target)
+    return target
+
+
+def load_spotify_manifest(
+    metadata_dir: Path,
+) -> tuple[dict[tuple[str, str], dict], dict[str, dict]]:
+    """Load the manifest written by `just collection`.
+
+    Returns `(by_key, by_isrc)` where `by_key` is indexed by
+    `(first_artist_norm, title_norm)` and `by_isrc` is indexed by the
+    uppercased ISRC. Empty dicts if the manifest is absent/unreadable.
+    """
+    target = metadata_dir / MANIFEST_NAME
+    if not target.exists():
+        return {}, {}
+    try:
+        data = json.loads(target.read_text())
+    except Exception as e:
+        logger.warning("could not read spotify manifest at {}: {}", target, e)
+        return {}, {}
+    by_key: dict[tuple[str, str], dict] = {}
+    by_isrc: dict[str, dict] = {}
+    for pl in data.get("playlists", []):
+        for t in pl.get("tracks", []):
+            artist = ", ".join(t.get("artists") or [])
+            k = (norm(first_artist(artist)), norm(t.get("title") or ""))
+            by_key.setdefault(k, t)
+            isrc = (t.get("isrc") or "").strip().upper()
+            if isrc:
+                by_isrc.setdefault(isrc, t)
+    return by_key, by_isrc
+
+
+def find_spotify_track(
+    path: Path,
+    by_key: dict[tuple[str, str], dict],
+    by_isrc: dict[str, dict],
+) -> dict | None:
+    """Resolve a file to its Spotify track via ISRC tag, then (artist, title)."""
+    try:
+        audio = MutagenFile(path, easy=True)
+    except Exception:
+        return None
+    if audio is None or audio.tags is None:
+        return None
+    tags = audio.tags
+
+    def first(k: str) -> str:
+        if hasattr(tags, "get"):
+            v = tags.get(k)
+            if v:
+                return str(v[0])
+        return ""
+
+    isrc = first("isrc").upper().strip()
+    if isrc and isrc in by_isrc:
+        return by_isrc[isrc]
+    artist = first("artist")
+    title = first("title")
+    if artist or title:
+        k = (norm(first_artist(artist)), norm(title))
+        return by_key.get(k)
+    return None
+
+
+# --------------------------------------------------------------------------- #
+# Tag writing (the canonical write path)                                     #
+# --------------------------------------------------------------------------- #
+
+
+def write_spotify_tags(track: dict, path: Path) -> bool:
+    """Overwrite the file's tags with the Spotify-canonical values.
+
+    Both pipelines call this. Writes title, artist (`", ".join`),
+    album, date, genre (list), and ISRC via mutagen's easy interface.
+    Empty Spotify values leave the existing tag untouched.
+
+    Returns True when at least one tag was written + saved.
+    """
+    try:
+        audio = MutagenFile(path, easy=True)
+    except Exception as e:
+        logger.warning("write_spotify_tags: cannot open {}: {}", path.name, e)
+        return False
+    if audio is None:
+        return False
+    if audio.tags is None:
+        try:
+            audio.add_tags()
+        except Exception as e:
+            logger.warning("write_spotify_tags: cannot init tags on {}: {}", path.name, e)
+            return False
+
+    wrote_any = False
+    title = (track.get("title") or "").strip()
+    if title:
+        audio.tags["title"] = title
+        wrote_any = True
+    artists = track.get("artists") or []
+    if artists:
+        audio.tags["artist"] = ", ".join(artists)
+        wrote_any = True
+    album = (track.get("album") or "").strip()
+    if album:
+        audio.tags["album"] = album
+        wrote_any = True
+    date = (track.get("release_date") or "").strip()
+    if date:
+        try:
+            audio.tags["date"] = date
+            wrote_any = True
+        except (KeyError, ValueError) as e:
+            logger.debug("date tag write skipped on {}: {}", path.name, e)
+    genres = track.get("genres") or []
+    if genres:
+        try:
+            audio.tags["genre"] = list(genres)
+            wrote_any = True
+        except (KeyError, ValueError) as e:
+            logger.debug("genre tag write skipped on {}: {}", path.name, e)
+    isrc = (track.get("isrc") or "").strip()
+    if isrc:
+        try:
+            audio.tags["isrc"] = isrc
+            wrote_any = True
+        except (KeyError, ValueError) as e:
+            logger.debug("isrc tag write skipped on {}: {}", path.name, e)
+
+    if not wrote_any:
+        return False
+    try:
+        audio.save()
+        return True
+    except Exception as e:
+        logger.warning("write_spotify_tags: save failed for {}: {}", path.name, e)
+        return False
+
+
+def write_bpm_tag(path: Path, bpm: float, *, overwrite: bool = False) -> bool:
+    """Write a `bpm` tag to the file. When `overwrite=False` (the default),
+    leaves any existing tag value alone — preserves human/label-set BPMs."""
+    try:
+        audio = MutagenFile(path, easy=True)
+    except Exception as e:
+        logger.warning("write_bpm_tag: cannot open {}: {}", path.name, e)
+        return False
+    if audio is None:
+        return False
+    if audio.tags is None:
+        try:
+            audio.add_tags()
+        except Exception as e:
+            logger.warning("write_bpm_tag: cannot init tags on {}: {}", path.name, e)
+            return False
+    if not overwrite:
+        existing = audio.tags.get("bpm") if hasattr(audio.tags, "get") else None
+        if existing and (existing[0] if isinstance(existing, list) else existing):
+            return False  # keep the existing tag
+    audio.tags["bpm"] = f"{bpm:.2f}"
+    try:
+        audio.save()
+        return True
+    except Exception as e:
+        logger.warning("write_bpm_tag: save failed for {}: {}", path.name, e)
+        return False
+
+
+def download_jpeg(url: str, *, timeout: float = 15.0) -> bytes | None:
+    """Sync GET of a Spotify album_image_url. Returns the raw bytes or
+    None on failure. Used by `embed_artwork_from_track` — kept sync so
+    both `just collection`'s async loop and `just export`'s sync loop
+    can call into the same helper without contortions."""
+    if not url:
+        return None
+    try:
+        import urllib.request
+        req = urllib.request.Request(url, headers={"User-Agent": "maple/1.0"})
+        with urllib.request.urlopen(req, timeout=timeout) as resp:
+            return resp.read()
+    except Exception as e:
+        logger.warning("artwork fetch failed for {}: {}", url, e)
+        return None
+
+
+def embed_artwork_from_track(track: dict, path: Path, *, force: bool = False) -> bool:
+    """Fetch the Spotify cover art for `track` and embed it into `path`.
+
+    No-op when the file already has embedded art (unless `force=True`).
+    Skips silently when the track dict has no `album_image_url` (Spotify
+    occasionally returns tracks without images).
+    """
+    if not force and has_embedded_art(path):
+        return False
+    url = (track.get("album_image_url") or "").strip()
+    if not url:
+        return False
+    data = download_jpeg(url)
+    if not data:
+        return False
+    try:
+        embed_art(path, data)
+        logger.info(
+            "embedded artwork for {} (from {})",
+            path.name, url.rsplit("/", 1)[-1][:40],
+        )
+        return True
+    except Exception as e:
+        logger.warning("embed_art failed for {}: {}", path.name, e)
+        return False
+
+
+def enrich_from_manifest(
+    path: Path,
+    by_key: dict[tuple[str, str], dict],
+    by_isrc: dict[str, dict],
+    analysis_cache_dir: Path | None = None,
+) -> dict | None:
+    """Find this file's Spotify entry, bring it to "valid" state, return
+    the matched track dict (or None if no match).
+
+    Steps:
+      1. Write canonical text tags via `write_spotify_tags`.
+      2. Fetch + embed album art if the file lacks it (`embed_artwork_from_track`).
+      3. If `analysis_cache_dir` is supplied and the cache has an entry for
+         this track's ISRC, write the cached BPM as a tag. This lets the
+         enrich pass bring a track all the way to "validates" without a
+         separate aubio-analysis step.
+    """
+    track = find_spotify_track(path, by_key, by_isrc)
+    if track is None:
+        return None
+    if write_spotify_tags(track, path):
+        logger.info(
+            "enriched {} from spotify (isrc={!r}, title={!r})",
+            path.name, (track.get("isrc") or "")[:12], (track.get("title") or "")[:32],
+        )
+    embed_artwork_from_track(track, path)
+
+    # Backfill BPM tag from the analysis cache when present. Avoids
+    # re-running aubio here — if the cache is cold, the per-track loop's
+    # write_anlz will populate it and write the tag in a later pass.
+    isrc = (track.get("isrc") or "").strip()
+    if analysis_cache_dir is not None and isrc:
+        from maple.analyze import load_analysis
+        cached = load_analysis(analysis_cache_dir, isrc)
+        if cached and cached.get("bpm"):
+            write_bpm_tag(path, cached["bpm"], overwrite=False)
+    return track

maple-py/src/maple/pdb/writer.py

@@ -2,6 +2,8 @@
 from pathlib import Path
 from struct import pack, unpack_from
 
+from loguru import logger
+
 from maple.model import (
     DEFAULT_COLUMNS,
     STANDARD_COLORS,
@@ -98,11 +100,21 @@ def _next_sequence(path: Path) -> int:
 
 
 def write_pdb(db: Database, path: str | Path) -> None:
+    logger.info(
+        "building pdb → {}  (tracks={} artists={} albums={} genres={} "
+        "artwork={} playlists={} entries={})",
+        path,
+        len(db.tracks), len(db.artists), len(db.albums), len(db.genres),
+        len(db.artwork), len(db.playlist_nodes), len(db.playlist_entries),
+    )
     # Refuse to emit a pdb with dangling foreign keys -- a track pointing at a
     # genre/artist/album/artwork row that doesn't exist makes the player follow
     # the FK into an empty table and freeze (freeze-class, like the deck hang).
     fk_errors = validate_referential_integrity(db)
     if fk_errors:
+        logger.error("FK validation failed with {} error(s)", len(fk_errors))
+        for e in fk_errors:
+            logger.error("  {}", e)
         raise ValueError("dangling foreign keys (would freeze the player):\n  " + "\n  ".join(fk_errors))
 
     # Layout (matching rekordbox): page 0 is the file header. Pages 1..2*N are
@@ -215,6 +227,7 @@ def write_pdb(db: Database, path: str | Path) -> None:
         b.next_page = free_sentinel
     for b in last_builders:
         pages_by_index[b.page_index] = b.finalize()
+    overflow_used = overflow_next - (1 + 2 * num_tables)
 
     # Materialise a small free pool of zero-filled pages and set next_unused PAST
     # it, mirroring a real export (e.g. data/MAPLE: 71 pages, next_unused=74 ->
@@ -232,6 +245,10 @@ def write_pdb(db: Database, path: str | Path) -> None:
     next_unused_page = file_page_count + 2
 
     sequence = _next_sequence(Path(path))
+    logger.info(
+        "pdb layout: {} pages ({} reserved, {} overflow, {} free), sequence={}",
+        file_page_count, 2 * num_tables, overflow_used, FREE_POOL_PAGES, sequence,
+    )
 
     file_header = b""
     file_header += pack("<I", 0)                  # magic
@@ -268,3 +285,4 @@ def write_pdb(db: Database, path: str | Path) -> None:
             page = pages_by_index.get(idx, blank)
             assert len(page) == PAGE_SIZE
             f.write(page)
+    logger.info("wrote {} ({} bytes)", out_path, out_path.stat().st_size)

maple-py/src/maple/track.py

@@ -0,0 +1,261 @@
+"""Canonical `Track` — the unit shared by `just collection` and `just export`.
+
+A *collection* is a sequence of `Track`s persisted under
+`data/collection/`. An *export* reads a sequence of `Track`s and writes a
+rekordbox USB at `data/usb/`. This dataclass is the bridge: any code that
+talks about "a track" in maple should hold one of these.
+
+Field semantics:
+  - Identity-ish fields (`isrc`, `title`, `artists`, `album`) start populated
+    from whichever source first knows the track — Spotify, a file's existing
+    tags, or a manual entry.
+  - Spotify-only fields (`spotify_track_id`, `release_date`, …) stay empty
+    for tracks that didn't come through the Spotify path.
+  - On-disk fields (`path`, `bitrate`, …) are populated once the audio is
+    actually on disk somewhere.
+  - Analytical fields (`bpm`, `beats`, …) populate during the audio-analysis
+    pass and are cached under `<collection>/_analysis/<isrc>.json`.
+
+The existing `maple.model.Track` is a *denormalised pdb row* — it carries
+artist_id/album_id/genre_id FKs that only exist in the context of a
+specific export. `Track.to_pdb_row(...)` projects this canonical Track
+into that shape using caller-supplied FK indices.
+"""
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from pathlib import Path
+
+from maple import model
+
+
+@dataclass
+class Track:
+    """Canonical track. Defaults intentionally permissive so partially-filled
+    instances flow through the pipeline; validation (`maple.validate`)
+    decides what counts as "complete enough to export"."""
+
+    # ---- identity --------------------------------------------------------- #
+    isrc: str = ""
+    title: str = ""
+    artists: list[str] = field(default_factory=list)
+    album: str = ""
+
+    # ---- Spotify-derived ------------------------------------------------- #
+    spotify_track_id: str = ""
+    spotify_artist_ids: list[str] = field(default_factory=list)
+    album_image_url: str = ""
+    release_date: str = ""              # "YYYY", "YYYY-MM", or "YYYY-MM-DD"
+    release_date_precision: str = ""
+    genres: list[str] = field(default_factory=list)
+    track_number: int = 0
+    disc_number: int = 0
+    duration_ms: int = 0
+
+    # ---- on-disk audio --------------------------------------------------- #
+    path: Path | None = None             # current best file location
+    file_size: int = 0
+    bitrate: int = 0                     # kbps
+    sample_rate: int = 0                 # Hz
+    sample_depth: int = 0                # bits per sample
+
+    # ---- analytical ------------------------------------------------------ #
+    bpm: float | None = None             # median-of-intervals tempo
+
+    # ---- provenance ------------------------------------------------------ #
+    source: str = ""                     # "spotify", "local", "bandcamp", …
+
+    # ---- views ----------------------------------------------------------- #
+
+    @property
+    def primary_artist(self) -> str:
+        return self.artists[0] if self.artists else ""
+
+    @property
+    def display_name(self) -> str:
+        if not self.title:
+            return self.path.name if self.path else "<unknown>"
+        if self.artists:
+            return f"{', '.join(self.artists)} - {self.title}"
+        return self.title
+
+    @property
+    def primary_genre(self) -> str:
+        return self.genres[0] if self.genres else ""
+
+    @property
+    def year(self) -> int:
+        """First 4 digits of release_date as an int (0 if absent/invalid)."""
+        if not self.release_date or len(self.release_date) < 4:
+            return 0
+        try:
+            return int(self.release_date[:4])
+        except ValueError:
+            return 0
+
+    @property
+    def duration_s(self) -> int:
+        return int(round(self.duration_ms / 1000)) if self.duration_ms else 0
+
+    # ---- ingress --------------------------------------------------------- #
+
+    @classmethod
+    def from_spotify(cls, d: dict) -> "Track":
+        """Build from one row of `maple.spotify.fetch_playlist`'s output."""
+        return cls(
+            isrc=(d.get("isrc") or "").strip(),
+            title=d.get("title") or "",
+            artists=list(d.get("artists") or []),
+            album=d.get("album") or "",
+            spotify_track_id=d.get("id") or "",
+            spotify_artist_ids=list(d.get("artist_ids") or []),
+            album_image_url=d.get("album_image_url") or "",
+            release_date=d.get("release_date") or "",
+            release_date_precision=d.get("release_date_precision") or "",
+            genres=list(d.get("genres") or []),
+            track_number=int(d.get("track_number") or 0),
+            disc_number=int(d.get("disc_number") or 0),
+            duration_ms=int(d.get("duration_ms") or 0),
+            source="spotify",
+        )
+
+    @classmethod
+    def from_file(cls, path: Path) -> "Track":
+        """Construct from on-disk audio via mutagen. Fields not in the file's
+        tags stay at their defaults; the caller can `merge_spotify` later to
+        fill them in canonically."""
+        from mutagen import File as MutagenFile
+
+        out = cls(path=path, source="local")
+        try:
+            audio = MutagenFile(path, easy=True)
+        except Exception:
+            return out
+        if audio is None:
+            return out
+        tags = audio.tags or {}
+        def first(k: str) -> str:
+            v = tags.get(k) if hasattr(tags, "get") else None
+            return (v[0] if v else "") if isinstance(v, list) else (v or "")
+        out.title = first("title")
+        artist = first("artist")
+        if artist:
+            out.artists = [a.strip() for a in artist.split(",") if a.strip()]
+        out.album = first("album")
+        out.isrc = first("isrc").strip()
+        out.release_date = first("date")
+        gtag = first("genre")
+        if gtag:
+            from maple.cli import split_genre_tags
+            out.genres = split_genre_tags(gtag)
+        try:
+            out.bpm = float(first("bpm")) if first("bpm") else None
+        except ValueError:
+            out.bpm = None
+        try:
+            out.track_number = int(first("tracknumber").split("/")[0])
+        except ValueError:
+            out.track_number = 0
+        info = getattr(audio, "info", None)
+        if info is not None:
+            out.duration_ms = int(round((getattr(info, "length", 0.0) or 0.0) * 1000))
+            bps = int(getattr(info, "bitrate", 0) or 0)
+            out.bitrate = bps // 1000 if bps > 1000 else bps
+            out.sample_rate = int(getattr(info, "sample_rate", 0) or 0)
+            out.sample_depth = int(getattr(info, "bits_per_sample", 0) or 0)
+        try:
+            out.file_size = path.stat().st_size
+        except OSError:
+            pass
+        return out
+
+    # ---- enrichment ------------------------------------------------------ #
+
+    def merge_spotify(self, d: dict) -> "Track":
+        """Overlay Spotify-canonical fields onto this Track *in place* — used
+        when we have a local file but Spotify carries better identity / genre
+        / release date. Empty Spotify fields are NOT applied (no clobbering)."""
+        if d.get("title"):
+            self.title = d["title"]
+        if d.get("artists"):
+            self.artists = list(d["artists"])
+        if d.get("album"):
+            self.album = d["album"]
+        if d.get("isrc"):
+            self.isrc = d["isrc"].strip()
+        if d.get("id"):
+            self.spotify_track_id = d["id"]
+        if d.get("artist_ids"):
+            self.spotify_artist_ids = list(d["artist_ids"])
+        if d.get("album_image_url"):
+            self.album_image_url = d["album_image_url"]
+        if d.get("release_date"):
+            self.release_date = d["release_date"]
+        if d.get("release_date_precision"):
+            self.release_date_precision = d["release_date_precision"]
+        if d.get("genres"):
+            self.genres = list(d["genres"])
+        if d.get("duration_ms"):
+            self.duration_ms = int(d["duration_ms"])
+        if d.get("track_number"):
+            self.track_number = int(d["track_number"])
+        if d.get("disc_number"):
+            self.disc_number = int(d["disc_number"])
+        if not self.source:
+            self.source = "spotify"
+        return self
+
+    def merge_analysis(self, analysis: dict) -> "Track":
+        """Merge fields from `maple.analyze.analyze_audio`'s output."""
+        if analysis.get("bpm") is not None:
+            self.bpm = float(analysis["bpm"])
+        return self
+
+    # ---- export adapter -------------------------------------------------- #
+
+    def to_pdb_row(
+        self,
+        *,
+        track_id: int,
+        artist_id: int,
+        album_id: int,
+        genre_id: int = 0,
+        artwork_id: int = 0,
+        file_path: str,
+        analyze_path: str = "",
+        date_added: str = "",
+        tempo_x100: int | None = None,
+    ) -> model.Track:
+        """Project this canonical Track into the denormalised pdb row shape.
+
+        FK ids (`artist_id`, `album_id`, …) and the per-export `file_path` /
+        `analyze_path` are caller-supplied because they only exist in the
+        context of a specific export. `tempo_x100` defaults to `round(bpm *
+        100)` when we have a BPM; pass through otherwise.
+        """
+        if tempo_x100 is None:
+            tempo_x100 = round(self.bpm * 100) if self.bpm else 0
+        return model.Track(
+            id=track_id,
+            title=self.title,
+            artist_id=artist_id,
+            album_id=album_id,
+            filename=Path(file_path).name,
+            file_path=file_path,
+            file_size=self.file_size,
+            sample_rate=self.sample_rate or 44100,
+            sample_depth=self.sample_depth or 16,
+            bitrate=self.bitrate,
+            duration=self.duration_s,
+            track_number=self.track_number,
+            year=self.year,
+            disc_number=self.disc_number,
+            tempo=tempo_x100,
+            release_date=self.release_date,
+            date_added=date_added,
+            analyze_path=analyze_path,
+            analyze_date=date_added,
+            artwork_id=artwork_id,
+            genre_id=genre_id,
+            source_path=self.path,
+        )

maple-py/src/maple/validate.py

@@ -0,0 +1,162 @@
+"""Cross-cutting per-track validator.
+
+A track is "valid" iff every export criterion holds. Both `just collection`
+(`Collection.process_track`) and `just export` (`cli.build`) must invoke
+this — there is no separate "collection-only" or "export-only" validation
+in maple. Add new criteria in one place; both pipelines pick them up.
+
+Criteria (extend as they emerge):
+    - ffprobe-decodable
+    - duration > 0
+    - title / artist / album / date / genre / isrc / bpm tags present
+    - embedded cover art present
+    - analytical BPM cached or fresh (cache key = ISRC)
+    - if `spotify_track` supplied: tags within fuzzy match of Spotify truth
+
+`validate_track` returns a list of `TrackIssue`. Empty list = passing.
+Callers decide whether to warn-and-continue (the default) or fail.
+"""
+from __future__ import annotations
+
+from dataclasses import dataclass
+from pathlib import Path
+
+from loguru import logger
+from mutagen import File as MutagenFile
+
+from maple.analyze import cache_path_for
+from maple.collection.index import (
+    first_artist,
+    fuzzy_ratio,
+    norm,
+    norm_loose,
+)
+from maple.collection.validate import (
+    DURATION_TOLERANCE_S,
+    ffprobe_ok,
+    file_duration,
+    has_embedded_art,
+)
+
+
+@dataclass
+class TrackIssue:
+    """A single validation finding.
+
+    Shape is (playlist, artist, title, reason) — `reason` is a
+    `"<field>: <detail>"` string so structured fields and free-text
+    descriptions share one container.
+    """
+
+    playlist: str
+    artist: str
+    title: str
+    reason: str
+
+
+REQUIRED_TAGS = ("title", "artist", "album", "date", "genre", "bpm", "isrc")
+
+
+def _file_tags(path: Path) -> dict[str, str] | None:
+    try:
+        audio = MutagenFile(path, easy=True)
+    except Exception as e:
+        logger.warning("could not open {} for validation: {}", path.name, e)
+        return None
+    if audio is None or audio.tags is None:
+        return {k: "" for k in REQUIRED_TAGS}
+    tags = audio.tags
+    return {k: (tags.get(k) or [""])[0] if hasattr(tags, "get") else "" for k in REQUIRED_TAGS}
+
+
+def validate_track(
+    path: Path,
+    *,
+    spotify_track: dict | None = None,
+    analysis_cache_dir: Path | None = None,
+    playlist: str = "",
+) -> list[TrackIssue]:
+    """Run every criterion against `path`. Returns the list of failed checks.
+
+    Optional context broadens the checks:
+      - `spotify_track`: enables fuzzy tag comparison against Spotify truth.
+      - `analysis_cache_dir`: enables the "analysis cached" check via ISRC.
+      - `playlist`: tags every issue with playlist context (collection flow).
+    """
+    tags = _file_tags(path)
+    if tags is None:
+        return [TrackIssue(playlist, "", path.name, "tags: could not read file")]
+
+    artist = tags.get("artist") or (
+        ", ".join(spotify_track.get("artists") or []) if spotify_track else ""
+    )
+    title = tags.get("title") or (spotify_track.get("title") if spotify_track else "") or path.stem
+    issues: list[TrackIssue] = []
+
+    def fail(field: str, detail: str) -> None:
+        issues.append(TrackIssue(playlist, artist, title, f"{field}: {detail}"))
+
+    # ---- audio integrity --------------------------------------------------- #
+    if not ffprobe_ok(path):
+        fail("decode", f"ffprobe rejected {path.name}")
+    duration = file_duration(path)
+    if duration <= 0:
+        fail("duration", "≤ 0s — corrupt file or unreadable container")
+
+    # ---- required tags ----------------------------------------------------- #
+    for key in REQUIRED_TAGS:
+        if not (tags.get(key) or "").strip():
+            fail(key, "tag missing")
+
+    # ---- artwork ----------------------------------------------------------- #
+    if not has_embedded_art(path):
+        fail("artwork", "no embedded cover art")
+
+    # ---- analysis cached --------------------------------------------------- #
+    isrc = (tags.get("isrc") or "").strip()
+    if analysis_cache_dir is not None and isrc:
+        cp = cache_path_for(analysis_cache_dir, isrc)
+        if cp is None or not cp.exists():
+            fail("analysis", f"no cached analysis at {cp}")
+
+    # ---- Spotify reconciliation -------------------------------------------- #
+    if spotify_track is not None:
+        sp_artist = ", ".join(spotify_track.get("artists") or [])
+        sp_title = (spotify_track.get("title") or "").strip()
+        sp_album = (spotify_track.get("album") or "").strip()
+        sp_isrc = (spotify_track.get("isrc") or "").strip()
+        sp_duration = (spotify_track.get("duration_ms") or 0) / 1000.0
+        sp_date = (spotify_track.get("release_date") or "").strip()
+
+        f_artist = tags.get("artist") or ""
+        f_title = tags.get("title") or ""
+        f_album = tags.get("album") or ""
+        f_isrc = tags.get("isrc") or ""
+        f_date = tags.get("date") or ""
+
+        if sp_artist and fuzzy_ratio(norm(first_artist(sp_artist)), norm(first_artist(f_artist))) < 0.5:
+            fail("artist", f"spotify={sp_artist!r} file={f_artist!r}")
+        if sp_title and fuzzy_ratio(norm_loose(sp_title), norm_loose(f_title)) < 0.5:
+            fail("title", f"spotify={sp_title!r} file={f_title!r}")
+        if sp_album and f_album and fuzzy_ratio(norm_loose(sp_album), norm_loose(f_album)) < 0.5:
+            fail("album", f"spotify={sp_album!r} file={f_album!r}")
+        elif sp_album and not f_album:
+            fail("album", f"spotify={sp_album!r} file=''")
+        if sp_isrc and f_isrc and sp_isrc.upper() != f_isrc.upper():
+            fail("isrc", f"spotify={sp_isrc!r} file={f_isrc!r}")
+        if sp_date and f_date and sp_date[:4] != f_date[:4]:
+            fail("date", f"spotify={sp_date!r} file={f_date!r}")
+        if sp_duration > 0 and abs(duration - sp_duration) > DURATION_TOLERANCE_S:
+            fail("duration", f"file {duration:.1f}s vs spotify {sp_duration:.1f}s")
+
+    return issues
+
+
+def log_issues(issues: list[TrackIssue], *, report: bool = True) -> None:
+    """Emit every issue via loguru.warning. When `report=True`, also bind
+    `extra["report"]` so any attached file-sink (Collection.attach_report_sink
+    or the export-side equivalent) captures the line."""
+    bound = logger.bind(report=True) if report else logger
+    for i in issues:
+        prefix = f"[{i.playlist}] " if i.playlist else ""
+        bound.warning("{}{} - {}: {}", prefix, i.artist, i.title, i.reason)

maple-py/uv.lock

@@ -90,6 +90,15 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/64/b4/17d4b0b2a2dc85a6df63d1157e028ed19f90d4cd97c36717afef2bc2f395/attrs-26.1.0-py3-none-any.whl", hash = "sha256:c647aa4a12dfbad9333ca4e71fe62ddc36f4e63b2d260a37a8b83d2f043ac309", size = 67548, upload-time = "2026-03-19T14:22:23.645Z" },
 ]
 
+[[package]]
+name = "aubio"
+version = "0.4.9"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "numpy" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/cd/80/302d89240603e5347c7f8026c8b02c59f8dfaec66c91a743d82de7c86006/aubio-0.4.9.tar.gz", hash = "sha256:df1244f6c4cf5bea382c8c2d35aa43bc31f4cf631fe325ae3992c219546a4202", size = 479008, upload-time = "2019-02-08T11:21:02.438Z" }
+
 [[package]]
 name = "bidict"
 version = "0.23.1"
@@ -243,10 +252,12 @@ version = "0.1.0"
 source = { editable = "." }
 dependencies = [
     { name = "aiohttp" },
+    { name = "aubio" },
     { name = "kaitaistruct" },
     { name = "loguru" },
     { name = "mutagen" },
     { name = "pillow" },
+    { name = "polars" },
     { name = "pyrekordbox" },
 ]
 
@@ -258,10 +269,12 @@ dev = [
 [package.metadata]
 requires-dist = [
     { name = "aiohttp", specifier = ">=3.10" },
+    { name = "aubio", specifier = ">=0.4.9" },
     { name = "kaitaistruct", specifier = ">=0.11" },
     { name = "loguru", specifier = ">=0.7" },
     { name = "mutagen", specifier = ">=1.47.0" },
     { name = "pillow", specifier = ">=12.2.0" },
+    { name = "polars", specifier = ">=1.0" },
     { name = "pyrekordbox", specifier = ">=0.4.4" },
 ]
 
@@ -402,6 +415,34 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/54/20/4d324d65cc6d9205fabedc306948156824eb9f0ee1633355a8f7ec5c66bf/pluggy-1.6.0-py3-none-any.whl", hash = "sha256:e920276dd6813095e9377c0bc5566d94c932c33b27a3e3945d8389c374dd4746", size = 20538, upload-time = "2025-05-15T12:30:06.134Z" },
 ]
 
+[[package]]
+name = "polars"
+version = "1.41.2"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "polars-runtime-32" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/ff/f9/aeda46259b0669247a160315d2d51269de9504b9dd2f70acadbcb22f46b7/polars-1.41.2.tar.gz", hash = "sha256:256d6731162371b77f3f29a55eacb8c0fc740ddb1a293a01d2ef5b5393c5c708", size = 737996, upload-time = "2026-05-29T17:39:15.604Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/1f/22/28f62d24f7db56ac4343588f9362d49b7b4177e55ac47a466fe696b0099b/polars-1.41.2-py3-none-any.whl", hash = "sha256:23ce9a2910b6e3e8d4258770bf44aa17170958df7af6e85feedf4458a04d8d29", size = 833445, upload-time = "2026-05-29T17:37:05.576Z" },
+]
+
+[[package]]
+name = "polars-runtime-32"
+version = "1.41.2"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/f9/56/54e3ea0e9b64f327179049e4742241cc6b1d3e8fa414b05a057dd26df367/polars_runtime_32-1.41.2.tar.gz", hash = "sha256:7af09ec1ab053da2c9669e8d15f809a4083a29be05db57111688b8051062af56", size = 2989474, upload-time = "2026-05-29T17:39:17.257Z" }
+wheels = [
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+
 [[package]]
 name = "propcache"
 version = "0.5.2"

maple-ts/README.md

@@ -1,17 +0,0 @@
-# maple-ts
-
-TypeScript/Bun port of `maple-py`. Builds a rekordbox `export.pdb` USB layout from a folder of audio files and `.m3u8` playlists.
-
-## Install
-
-```sh
-bun install
-```
-
-## Run
-
-```sh
-bun run src/cli.ts ./data/input ./data/usb
-```
-
-Requires `ffmpeg` on `PATH` for FLAC -> MP3 conversion.

maple-ts/package.json

@@ -1,22 +0,0 @@
-{
-    "name": "maple",
-    "version": "0.1.0",
-    "description": "Build a rekordbox USB from a folder of audio + m3u8 playlists",
-    "type": "module",
-    "module": "src/cli.ts",
-    "bin": {
-        "maple": "src/cli.ts"
-    },
-    "scripts": {
-        "maple": "bun run src/cli.ts",
-        "test": "bun test"
-    },
-    "devDependencies": {
-        "@types/bun": "latest",
-        "@types/node-id3": "^0.2.6"
-    },
-    "dependencies": {
-        "music-metadata": "^10.5.0",
-        "node-id3": "^0.2.6"
-    }
-}

maple-ts/src/cli.ts

@@ -1,177 +0,0 @@
-#!/usr/bin/env bun
-/** maple CLI: scan a directory of audio + m3u8 playlists and build a rekordbox USB. */
-import { stat } from "node:fs/promises";
-import { basename, extname, join, resolve } from "node:path";
-import os from "node:os";
-
-import { convertFlacToMp3, verifyDuration } from "./convert.ts";
-import { stageAudio, stagedPath } from "./copy.ts";
-import { readTags } from "./meta.ts";
-import { newDatabase, newTrack, type Database } from "./model.ts";
-import { writePdb } from "./pdb/writer.ts";
-import { scanAudio, scanPlaylists } from "./scan.ts";
-
-function today(): string {
-    return new Date().toISOString().slice(0, 10);
-}
-
-function withSuffix(file: string, newExt: string): string {
-    const ext = extname(file);
-    return file.slice(0, file.length - ext.length) + newExt;
-}
-
-async function isDir(p: string): Promise<boolean> {
-    try { return (await stat(p)).isDirectory(); } catch { return false; }
-}
-
-async function pMap<T, R>(items: T[], workers: number, fn: (item: T) => Promise<R>): Promise<R[]> {
-    const out: R[] = new Array(items.length);
-    let i = 0;
-    const runners = Array.from({ length: Math.max(1, Math.min(workers, items.length)) }, async () => {
-        while (true) {
-            const idx = i++;
-            if (idx >= items.length) return;
-            out[idx] = await fn(items[idx]!);
-        }
-    });
-    await Promise.all(runners);
-    return out;
-}
-
-export async function build(inputDir: string, usbRoot: string): Promise<Database> {
-    const db = newDatabase();
-    const dateAdded = today();
-
-    const artistIndex = new Map<string, number>();
-    const albumIndex = new Map<string, number>();
-    const trackBySrc = new Map<string, number>();
-
-    const audioFiles = await scanAudio(inputDir);
-
-    const initialMeta = new Map<string, Awaited<ReturnType<typeof readTags>>>();
-    for (const p of audioFiles) initialMeta.set(p, await readTags(p));
-
-    const flacJobs: Array<{ src: string; dst: string }> = [];
-    for (const original of audioFiles) {
-        if (extname(original).toLowerCase() === ".flac") {
-            const m = initialMeta.get(original)!;
-            const mp3Name = withSuffix(basename(original), ".mp3");
-            const { destAbs } = stagedPath(usbRoot, m.artist, m.album, mp3Name);
-            flacJobs.push({ src: original, dst: destAbs });
-        }
-    }
-
-    const workers = Math.max(1, os.cpus().length || 1);
-    const results = await pMap(flacJobs, workers, async (job) => {
-        const converted = await convertFlacToMp3(job.src, job.dst);
-        return { ...job, converted };
-    });
-    for (const r of results) {
-        const rel = r.src.startsWith(inputDir) ? r.src.slice(inputDir.length).replace(/^[\/\\]+/, "") : r.src;
-        console.log(`${r.converted ? "convert" : "cached "} ${rel}`);
-        await verifyDuration(r.src, r.dst);
-    }
-
-    for (const original of audioFiles) {
-        let meta = initialMeta.get(original)!;
-        let artistId = artistIndex.get(meta.artist);
-        if (artistId === undefined) {
-            artistId = db.artists.length + 1;
-            artistIndex.set(meta.artist, artistId);
-            db.artists.push({ id: artistId, name: meta.artist });
-        }
-        const albumKey = `${artistId}\x00${meta.album}`;
-        let albumId = albumIndex.get(albumKey);
-        if (albumId === undefined) {
-            albumId = db.albums.length + 1;
-            albumIndex.set(albumKey, albumId);
-            db.albums.push({ id: albumId, name: meta.album, artist_id: artistId });
-        }
-
-        let filePath: string;
-        if (extname(original).toLowerCase() === ".flac") {
-            const mp3Name = withSuffix(basename(original), ".mp3");
-            const s = stagedPath(usbRoot, meta.artist, meta.album, mp3Name);
-            filePath = s.filePath;
-            meta = await readTags(s.destAbs);
-        } else {
-            const s = await stageAudio(original, usbRoot, meta.artist, meta.album);
-            filePath = s.filePath;
-        }
-
-        const trackId = db.tracks.length + 1;
-        db.tracks.push(newTrack({
-            id: trackId,
-            title: meta.title,
-            artist_id: artistId,
-            album_id: albumId,
-            filename: basename(filePath),
-            file_path: filePath,
-            file_size: meta.file_size,
-            sample_rate: meta.sample_rate,
-            sample_depth: meta.sample_depth,
-            bitrate: meta.bitrate,
-            duration: meta.duration,
-            track_number: meta.track_number,
-            year: meta.year,
-            date_added: dateAdded,
-            source_path: original,
-        }));
-        trackBySrc.set(resolve(original), trackId);
-    }
-
-    const playlists = await scanPlaylists(inputDir);
-    let sortOrder = 1;
-    for (const [name, paths] of playlists) {
-        const playlistId = db.playlist_nodes.length + 1;
-        db.playlist_nodes.push({
-            id: playlistId,
-            parent_id: 0,
-            sort_order: sortOrder,
-            name,
-            is_folder: false,
-        });
-        sortOrder += 1;
-        let entryIndex = 1;
-        for (const p of paths) {
-            const tid = trackBySrc.get(resolve(p));
-            if (tid === undefined) {
-                console.error(`warning: playlist '${name}' references missing file ${p}`);
-                continue;
-            }
-            db.playlist_entries.push({
-                playlist_id: playlistId,
-                track_id: tid,
-                entry_index: entryIndex,
-            });
-            entryIndex += 1;
-        }
-    }
-
-    return db;
-}
-
-async function main(argv: string[]): Promise<number> {
-    const args = argv.slice(2);
-    const inputDir = args[0] ?? "./data/input";
-    const outputRoot = args[1] ?? "./data/usb";
-
-    if (!(await isDir(inputDir))) {
-        console.error(`error: input_dir ${inputDir} is not a directory`);
-        return 2;
-    }
-
-    const db = await build(inputDir, outputRoot);
-    const pdbPath = join(outputRoot, "PIONEER", "rekordbox", "export.pdb");
-    await writePdb(db, pdbPath);
-
-    console.log(
-        `wrote ${db.tracks.length} tracks, ${db.artists.length} artists, ${db.albums.length} albums, ` +
-        `${db.playlist_nodes.length} playlists (${db.playlist_entries.length} entries) to ${pdbPath}`
-    );
-    return 0;
-}
-
-if (import.meta.main) {
-    process.exit(await main(process.argv));
-}

maple-ts/src/convert.ts

@@ -1,90 +0,0 @@
-/**
- * FLAC -> MP3 V0 joint-stereo conversion via ffmpeg, with source-hash dedup.
- *
- * The SHA-256 of the source FLAC is stamped into a TXXX:MAPLE_SRC_SHA256 ID3
- * frame on the produced MP3. Reruns skip conversion when the existing MP3
- * carries the matching hash, so the cache is content-addressed against inputs.
- */
-import { mkdir, access } from "node:fs/promises";
-import { dirname } from "node:path";
-import { parseFile } from "music-metadata";
-import NodeID3 from "node-id3";
-
-const HASH_FRAME_DESC = "MAPLE_SRC_SHA256";
-
-export async function fileSha256(path: string): Promise<string> {
-    const hasher = new Bun.CryptoHasher("sha256");
-    const stream = Bun.file(path).stream();
-    for await (const chunk of stream) hasher.update(chunk);
-    return hasher.digest("hex");
-}
-
-async function exists(p: string): Promise<boolean> {
-    try { await access(p); return true; } catch { return false; }
-}
-
-function readSourceHash(mp3: string): string | null {
-    const tags = NodeID3.read(mp3);
-    const frames = tags.userDefinedText;
-    if (!frames) return null;
-    for (const f of frames) {
-        if (f.description === HASH_FRAME_DESC && f.value) return f.value;
-    }
-    return null;
-}
-
-function writeSourceHash(mp3: string, sha: string): void {
-    NodeID3.update({ userDefinedText: [{ description: HASH_FRAME_DESC, value: sha }] }, mp3);
-}
-
-async function which(cmd: string): Promise<boolean> {
-    const p = Bun.spawn({ cmd: ["which", cmd], stdout: "pipe", stderr: "pipe" });
-    await p.exited;
-    return p.exitCode === 0;
-}
-
-export async function convertFlacToMp3(flac: string, mp3: string): Promise<boolean> {
-    const srcHash = await fileSha256(flac);
-    if (await exists(mp3)) {
-        try {
-            if (readSourceHash(mp3) === srcHash) return false;
-        } catch {}
-    }
-
-    if (!(await which("ffmpeg"))) throw new Error("ffmpeg not found on PATH");
-
-    await mkdir(dirname(mp3), { recursive: true });
-    const proc = Bun.spawn({
-        cmd: [
-            "ffmpeg", "-nostdin", "-loglevel", "error", "-y",
-            "-i", flac,
-            "-codec:a", "libmp3lame",
-            "-q:a", "0",
-            "-joint_stereo", "1",
-            "-map_metadata", "0",
-            mp3,
-        ],
-        stdout: "inherit",
-        stderr: "inherit",
-    });
-    await proc.exited;
-    if (proc.exitCode !== 0) throw new Error(`ffmpeg failed for ${flac}`);
-    writeSourceHash(mp3, srcHash);
-    return true;
-}
-
-async function duration(path: string): Promise<number> {
-    try {
-        const md = await parseFile(path, { duration: true });
-        return md.format.duration ?? 0;
-    } catch {
-        return 0;
-    }
-}
-
-export async function verifyDuration(src: string, dst: string, tolerance = 0.1): Promise<void> {
-    const [a, b] = await Promise.all([duration(src), duration(dst)]);
-    if (Math.abs(a - b) > tolerance) {
-        throw new Error(`duration mismatch: ${src} = ${a.toFixed(3)}s vs ${dst} = ${b.toFixed(3)}s (Δ ${Math.abs(a - b).toFixed(3)}s)`);
-    }
-}

maple-ts/src/copy.ts

@@ -1,29 +0,0 @@
-import { dirname, join, basename } from "node:path";
-import { mkdir, copyFile, access } from "node:fs/promises";
-
-const BAD = /[\\/:*?"<>|\x00-\x1f]/g;
-
-export function sanitise(component: string): string {
-    const s = component.replace(BAD, "_").replace(/^[ .]+|[ .]+$/g, "");
-    return s || "_";
-}
-
-export function stagedPath(usbRoot: string, artist: string, album: string, filename: string): { destAbs: string; filePath: string } {
-    const relParts = ["Contents", sanitise(artist), sanitise(album), sanitise(filename)];
-    const destAbs = join(usbRoot, ...relParts);
-    const filePath = "/" + relParts.join("/");
-    return { destAbs, filePath };
-}
-
-async function exists(p: string): Promise<boolean> {
-    try { await access(p); return true; } catch { return false; }
-}
-
-export async function stageAudio(src: string, usbRoot: string, artist: string, album: string): Promise<{ destAbs: string; filePath: string }> {
-    const { destAbs, filePath } = stagedPath(usbRoot, artist, album, basename(src));
-    await mkdir(dirname(destAbs), { recursive: true });
-    if (!(await exists(destAbs))) {
-        await copyFile(src, destAbs);
-    }
-    return { destAbs, filePath };
-}

maple-ts/src/meta.ts

@@ -1,62 +0,0 @@
-import { parseFile } from "music-metadata";
-import { basename, extname } from "node:path";
-import { stat } from "node:fs/promises";
-
-export interface TrackMeta {
-    title: string;
-    artist: string;
-    album: string;
-    track_number: number;
-    year: number;
-    duration: number;
-    bitrate: number;
-    sample_rate: number;
-    sample_depth: number;
-    file_size: number;
-}
-
-function toInt(v: unknown): number {
-    if (v === null || v === undefined) return 0;
-    let s = String(Array.isArray(v) ? v[0] : v).trim();
-    if (!s) return 0;
-    s = s.split("/")[0]!;
-    const n = parseInt(s, 10);
-    return Number.isFinite(n) ? n : 0;
-}
-
-export async function readTags(path: string): Promise<TrackMeta> {
-    const { size: file_size } = await stat(path);
-    const stem = basename(path, extname(path));
-    try {
-        const md = await parseFile(path, { duration: true });
-        const c = md.common;
-        const info = md.format;
-        const bitrate_bps = info.bitrate ?? 0;
-        const bitrate = bitrate_bps > 1000 ? Math.floor(bitrate_bps / 1000) : bitrate_bps;
-        return {
-            title: c.title || stem,
-            artist: c.artist || "Unknown Artist",
-            album: c.album || "Unknown Album",
-            track_number: toInt(c.track?.no),
-            year: toInt(c.year ?? c.date),
-            duration: Math.floor(info.duration ?? 0),
-            bitrate,
-            sample_rate: info.sampleRate ?? 44100,
-            sample_depth: info.bitsPerSample ?? 16,
-            file_size,
-        };
-    } catch {
-        return {
-            title: stem,
-            artist: "Unknown Artist",
-            album: "Unknown Album",
-            track_number: 0,
-            year: 0,
-            duration: 0,
-            bitrate: 0,
-            sample_rate: 44100,
-            sample_depth: 16,
-            file_size,
-        };
-    }
-}

maple-ts/src/model.ts

@@ -1,83 +0,0 @@
-export interface Artist {
-    id: number;
-    name: string;
-}
-
-export interface Album {
-    id: number;
-    name: string;
-    artist_id: number;
-}
-
-export interface Track {
-    id: number;
-    title: string;
-    artist_id: number;
-    album_id: number;
-    filename: string;
-    file_path: string;
-    file_size: number;
-    sample_rate: number;
-    sample_depth: number;
-    bitrate: number;
-    duration: number;
-    track_number: number;
-    year: number;
-    disc_number: number;
-    tempo: number;
-    comment: string;
-    date_added: string;
-    release_date: string;
-    mix_name: string;
-    analyze_path: string;
-    analyze_date: string;
-    source_path: string | null;
-}
-
-export interface PlaylistNode {
-    id: number;
-    parent_id: number;
-    sort_order: number;
-    name: string;
-    is_folder: boolean;
-}
-
-export interface PlaylistEntry {
-    playlist_id: number;
-    track_id: number;
-    entry_index: number;
-}
-
-export interface Database {
-    tracks: Track[];
-    artists: Artist[];
-    albums: Album[];
-    playlist_nodes: PlaylistNode[];
-    playlist_entries: PlaylistEntry[];
-}
-
-export function newDatabase(): Database {
-    return { tracks: [], artists: [], albums: [], playlist_nodes: [], playlist_entries: [] };
-}
-
-export function newTrack(init: Pick<Track, "id" | "title" | "artist_id" | "album_id" | "filename" | "file_path"> & Partial<Track>): Track {
-    return {
-        file_size: 0,
-        sample_rate: 44100,
-        sample_depth: 16,
-        bitrate: 0,
-        duration: 0,
-        track_number: 0,
-        year: 0,
-        disc_number: 0,
-        tempo: 0,
-        comment: "",
-        date_added: "",
-        release_date: "",
-        mix_name: "",
-        analyze_path: "",
-        analyze_date: "",
-        source_path: null,
-        ...init,
-    };
-}

maple-ts/src/pdb/buf.ts

@@ -1,44 +0,0 @@
-/** Small little-endian write helpers backed by Uint8Array. */
-export class LE {
-    parts: Uint8Array[] = [];
-    private len = 0;
-
-    push(u: Uint8Array): void { this.parts.push(u); this.len += u.length; }
-
-    u8(v: number): void {
-        const b = new Uint8Array(1); b[0] = v & 0xff; this.push(b);
-    }
-    u16(v: number): void {
-        const b = new Uint8Array(2);
-        b[0] = v & 0xff;
-        b[1] = (v >> 8) & 0xff;
-        this.push(b);
-    }
-    u32(v: number): void {
-        const b = new Uint8Array(4);
-        b[0] = v & 0xff;
-        b[1] = (v >>> 8) & 0xff;
-        b[2] = (v >>> 16) & 0xff;
-        b[3] = (v >>> 24) & 0xff;
-        this.push(b);
-    }
-    bytes(b: Uint8Array): void { this.push(b); }
-
-    length(): number { return this.len; }
-
-    build(): Uint8Array {
-        const out = new Uint8Array(this.len);
-        let o = 0;
-        for (const p of this.parts) { out.set(p, o); o += p.length; }
-        return out;
-    }
-}
-
-export function concat(parts: Uint8Array[]): Uint8Array {
-    let len = 0;
-    for (const p of parts) len += p.length;
-    const out = new Uint8Array(len);
-    let o = 0;
-    for (const p of parts) { out.set(p, o); o += p.length; }
-    return out;
-}

maple-ts/src/pdb/pager.ts

@@ -1,95 +0,0 @@
-import { LE } from "./buf.ts";
-
-export const PAGE_SIZE = 4096;
-const HEADER_SIZE = 40;
-const ROW_GROUP_SIZE = 36;
-const ROWS_PER_GROUP = 16;
-
-function align4(o: number): number { return (o + 3) & ~3; }
-function numRowGroups(n: number): number { return Math.floor((n + ROWS_PER_GROUP - 1) / ROWS_PER_GROUP); }
-
-export class PageBuilder {
-    pageIndex: number;
-    pageType: number;
-    nextPage: number;
-    rowBytes: Uint8Array[] = [];
-    rowOffsets: number[] = [];
-    heapCursor = 0;
-
-    constructor(pageIndex: number, pageType: number) {
-        this.pageIndex = pageIndex;
-        this.pageType = pageType;
-        this.nextPage = pageIndex;
-    }
-
-    tryAdd(row: Uint8Array): boolean {
-        const aligned = align4(this.heapCursor);
-        const end = aligned + row.length;
-        const footerAfter = numRowGroups(this.rowBytes.length + 1) * ROW_GROUP_SIZE;
-        if (end + HEADER_SIZE + footerAfter > PAGE_SIZE) return false;
-        this.rowOffsets.push(aligned);
-        this.rowBytes.push(row);
-        this.heapCursor = end;
-        return true;
-    }
-
-    numRows(): number { return this.rowBytes.length; }
-
-    finalize(): Uint8Array {
-        const n = this.rowBytes.length;
-        const numRgs = numRowGroups(n);
-        const footerSize = numRgs * ROW_GROUP_SIZE;
-        const heapPadding = PAGE_SIZE - HEADER_SIZE - footerSize;
-        const usedSize = this.heapCursor;
-        const freeSize = heapPadding - usedSize;
-        if (freeSize < 0) throw new Error("page overflow");
-
-        const pageFlags = n > 0 ? 0x00 : 0x44;
-
-        const h = new LE();
-        h.u32(0); // magic
-        h.u32(this.pageIndex);
-        h.u32(this.pageType);
-        h.u32(this.nextPage);
-        h.u32(0); // unknown1
-        h.u32(0); // unknown2
-        h.u8(n & 0xff); h.u8(0); h.u8(0); h.u8(pageFlags);
-        h.u16(freeSize); h.u16(usedSize);
-        h.u16(0);  // unknown5
-        h.u16(n);  // num_rows_large
-        h.u16(0);  // unknown6
-        h.u16(0);  // unknown7
-        const header = h.build();
-        if (header.length !== HEADER_SIZE) throw new Error(`hdr len ${header.length}`);
-
-        const heap = new Uint8Array(heapPadding);
-        for (let i = 0; i < this.rowBytes.length; i++) {
-            heap.set(this.rowBytes[i]!, this.rowOffsets[i]!);
-        }
-
-        const footer = new LE();
-        for (let g = numRgs - 1; g >= 0; g--) {
-            const start = g * ROWS_PER_GROUP;
-            const grpOffsets = this.rowOffsets.slice(start, start + ROWS_PER_GROUP);
-            const grpCount = grpOffsets.length;
-            const padded = grpOffsets.slice();
-            while (padded.length < ROWS_PER_GROUP) padded.push(0);
-            const presence = (1 << grpCount) - 1;
-            const rg = new LE();
-            for (let i = padded.length - 1; i >= 0; i--) rg.u16(padded[i]!);
-            rg.u16(presence);
-            rg.u16(16);
-            const rgBytes = rg.build();
-            if (rgBytes.length !== ROW_GROUP_SIZE) throw new Error("rg size");
-            footer.bytes(rgBytes);
-        }
-        const footerBytes = footer.build();
-        if (footerBytes.length !== footerSize) throw new Error("footer size");
-
-        const out = new Uint8Array(PAGE_SIZE);
-        out.set(header, 0);
-        out.set(heap, HEADER_SIZE);
-        out.set(footerBytes, HEADER_SIZE + heapPadding);
-        return out;
-    }
-}

maple-ts/src/pdb/rows.ts

@@ -1,148 +0,0 @@
-import type { Album, Artist, PlaylistEntry, PlaylistNode, Track } from "../model.ts";
-import { encodeDevicesql } from "./strings.ts";
-import { LE, concat } from "./buf.ts";
-
-const TRACK_FIXED_PREFIX = 0x5e;
-const TRACK_OFS_STRINGS_START = TRACK_FIXED_PREFIX;
-const TRACK_HEADER_LEN = TRACK_OFS_STRINGS_START + 21 * 2;
-
-function pad2(b: Uint8Array): Uint8Array {
-    if (b.length & 1) {
-        const out = new Uint8Array(b.length + 1);
-        out.set(b);
-        return out;
-    }
-    return b;
-}
-
-export function serializeTrack(t: Track): Uint8Array {
-    const strings: string[] = [
-        "",                  // 0  isrc
-        "",                  // 1  texter
-        "1",                 // 2  unknown_string_2
-        "2",                 // 3  unknown_string_3
-        "",                  // 4  unknown_string_4
-        "",                  // 5  message
-        "ON",                // 6  kuvo_public
-        "ON",                // 7  autoload_hot_cues
-        "",                  // 8  unknown_string_5
-        "",                  // 9  unknown_string_6
-        t.date_added,        // 10
-        t.release_date,      // 11
-        t.mix_name,          // 12
-        "",                  // 13
-        t.analyze_path,      // 14
-        t.analyze_date,      // 15
-        t.comment,           // 16
-        t.title,             // 17
-        "",                  // 18
-        t.filename,          // 19
-        t.file_path,         // 20
-    ];
-
-    const encoded = strings.map(encodeDevicesql);
-    const offsets: number[] = [];
-    let cursor = TRACK_HEADER_LEN;
-    for (const e of encoded) {
-        offsets.push(cursor);
-        cursor += e.length;
-    }
-    const blob = concat(encoded);
-
-    const p = new LE();
-    p.u16(0x24); p.u16(0);              // subtype, index_shift
-    p.u32(788224);                       // bitmask
-    p.u32(t.sample_rate);
-    p.u32(0);                            // composer_id
-    p.u32(t.file_size);
-    p.u32(0);                            // unknown
-    p.u16(19048);
-    p.u16(30967);
-    p.u32(0); // artwork_id
-    p.u32(0); // key_id
-    p.u32(0); // original_artist_id
-    p.u32(0); // label_id
-    p.u32(0); // remixer_id
-    p.u32(t.bitrate);
-    p.u32(t.track_number);
-    p.u32(t.tempo);
-    p.u32(0); // genre_id
-    p.u32(t.album_id);
-    p.u32(t.artist_id);
-    p.u32(t.id);
-    p.u16(t.disc_number);
-    p.u16(0); // play_count
-    p.u16(t.year);
-    p.u16(t.sample_depth);
-    p.u16(t.duration);
-    p.u16(41);
-    p.u8(0); p.u8(0); // color_id, rating
-    p.u16(1);
-    p.u16(3);
-
-    const prefix = p.build();
-    if (prefix.length !== TRACK_FIXED_PREFIX) throw new Error(`prefix len ${prefix.length}`);
-
-    const ofs = new LE();
-    for (const o of offsets) ofs.u16(o);
-    return pad2(concat([prefix, ofs.build(), blob]));
-}
-
-export function serializeArtist(a: Artist): Uint8Array {
-    const name = encodeDevicesql(a.name);
-    const nearOfs = 0x0a;
-    const farThreshold = 0x100;
-    const r = new LE();
-    if (nearOfs < farThreshold) {
-        r.u16(0x60); r.u16(a.id & 0xffff);
-        r.u32(a.id);
-        r.u8(0x03);
-        r.u8(nearOfs);
-        if (r.length() !== nearOfs) throw new Error("artist near offset mismatch");
-        r.bytes(name);
-    } else {
-        const far = 0x0e;
-        r.u16(0x64); r.u16(a.id & 0xffff);
-        r.u32(a.id);
-        r.u8(0x03);
-        r.u8(0);
-        r.u16(far);
-        r.bytes(name);
-    }
-    return pad2(r.build());
-}
-
-export function serializeAlbum(a: Album): Uint8Array {
-    const name = encodeDevicesql(a.name);
-    const nearOfs = 0x16;
-    const r = new LE();
-    r.u16(0x80); r.u16(a.id & 0xffff);
-    r.u32(0);
-    r.u32(a.artist_id);
-    r.u32(a.id);
-    r.u32(0);
-    r.u8(0x03);
-    r.u8(nearOfs);
-    if (r.length() !== nearOfs) throw new Error("album near offset mismatch");
-    r.bytes(name);
-    return pad2(r.build());
-}
-
-export function serializePlaylistTree(n: PlaylistNode): Uint8Array {
-    const r = new LE();
-    r.u32(n.parent_id);
-    r.u32(0);
-    r.u32(n.sort_order);
-    r.u32(n.id);
-    r.u32(n.is_folder ? 1 : 0);
-    r.bytes(encodeDevicesql(n.name));
-    return pad2(r.build());
-}
-
-export function serializePlaylistEntry(e: PlaylistEntry): Uint8Array {
-    const r = new LE();
-    r.u32(e.entry_index);
-    r.u32(e.track_id);
-    r.u32(e.playlist_id);
-    return r.build();
-}

maple-ts/src/pdb/strings.ts

@@ -1,33 +0,0 @@
-const EMPTY = new Uint8Array([0x03]);
-
-function isAscii(s: string): boolean {
-    for (let i = 0; i < s.length; i++) if (s.charCodeAt(i) > 0x7f) return false;
-    return true;
-}
-
-export function encodeDevicesql(s: string): Uint8Array {
-    if (!s) return EMPTY;
-    if (isAscii(s) && s.length < 127) {
-        const ascii = new TextEncoder().encode(s);
-        const length = ascii.length + 1;
-        const lengthAndKind = ((length << 1) | 1) & 0xff;
-        const out = new Uint8Array(1 + ascii.length);
-        out[0] = lengthAndKind;
-        out.set(ascii, 1);
-        return out;
-    }
-    const utf16 = new Uint8Array(s.length * 2);
-    for (let i = 0; i < s.length; i++) {
-        const c = s.charCodeAt(i);
-        utf16[i * 2] = c & 0xff;
-        utf16[i * 2 + 1] = (c >> 8) & 0xff;
-    }
-    const totalLength = utf16.length + 4;
-    const out = new Uint8Array(4 + utf16.length);
-    out[0] = 0x90;
-    out[1] = totalLength & 0xff;
-    out[2] = (totalLength >> 8) & 0xff;
-    out[3] = 0x00;
-    out.set(utf16, 4);
-    return out;
-}

maple-ts/src/pdb/writer.ts

@@ -1,122 +0,0 @@
-import { mkdir, writeFile } from "node:fs/promises";
-import { dirname } from "node:path";
-import type { Database } from "../model.ts";
-import { PAGE_SIZE, PageBuilder } from "./pager.ts";
-import {
-    serializeAlbum,
-    serializeArtist,
-    serializePlaylistEntry,
-    serializePlaylistTree,
-    serializeTrack,
-} from "./rows.ts";
-import { LE } from "./buf.ts";
-
-const PAGE_TYPE_TRACKS = 0;
-const PAGE_TYPE_ARTISTS = 2;
-const PAGE_TYPE_ALBUMS = 3;
-const PAGE_TYPE_PLAYLIST_TREE = 7;
-const PAGE_TYPE_PLAYLIST_ENTRIES = 8;
-
-const FILE_HEADER_SIZE = 28;
-const TABLE_ENTRY_SIZE = 16;
-
-interface Chain {
-    pageType: number;
-    pages: Uint8Array[];
-    first: number;
-    last: number;
-}
-
-function buildChain(pageType: number, rows: Uint8Array[], startIndex: number): Chain {
-    const builders: PageBuilder[] = [];
-    let idx = startIndex;
-    let current = new PageBuilder(idx, pageType);
-
-    for (const row of rows) {
-        if (!current.tryAdd(row)) {
-            builders.push(current);
-            idx += 1;
-            current = new PageBuilder(idx, pageType);
-            if (!current.tryAdd(row)) {
-                throw new Error(`row of size ${row.length} too large for an empty page`);
-            }
-        }
-    }
-    builders.push(current);
-
-    const out: Uint8Array[] = [];
-    for (let i = 0; i < builders.length; i++) {
-        const p = builders[i]!;
-        if (i === builders.length - 1) p.nextPage = p.pageIndex;
-        else p.nextPage = p.pageIndex + 1;
-        out.push(p.finalize());
-    }
-
-    return { pageType, pages: out, first: startIndex, last: idx };
-}
-
-export async function writePdb(db: Database, path: string): Promise<void> {
-    const chains: Chain[] = [];
-    let nextIdx = 1;
-
-    const tables: Array<[number, Uint8Array[]]> = [
-        [PAGE_TYPE_TRACKS, db.tracks.map(serializeTrack)],
-        [PAGE_TYPE_ARTISTS, db.artists.map(serializeArtist)],
-        [PAGE_TYPE_ALBUMS, db.albums.map(serializeAlbum)],
-        [PAGE_TYPE_PLAYLIST_TREE, db.playlist_nodes.map(serializePlaylistTree)],
-        [PAGE_TYPE_PLAYLIST_ENTRIES, db.playlist_entries.map(serializePlaylistEntry)],
-    ];
-
-    for (const [ptype, rows] of tables) {
-        const c = buildChain(ptype, rows, nextIdx);
-        chains.push(c);
-        nextIdx = c.last + 1;
-    }
-
-    const numTables = chains.length;
-    const nextUnused = nextIdx;
-
-    const h = new LE();
-    h.u32(0);
-    h.u32(PAGE_SIZE);
-    h.u32(numTables);
-    h.u32(nextUnused);
-    h.u32(0);
-    h.u32(1);
-    h.u32(0);
-    const fileHeader = h.build();
-    if (fileHeader.length !== FILE_HEADER_SIZE) throw new Error("file header size");
-
-    const tbl = new LE();
-    for (const c of chains) {
-        tbl.u32(c.pageType);
-        tbl.u32(0);
-        tbl.u32(c.first);
-        tbl.u32(c.last);
-    }
-    const tablesBlock = tbl.build();
-    if (tablesBlock.length !== numTables * TABLE_ENTRY_SIZE) throw new Error("tables size");
-
-    const headerFull = new Uint8Array(fileHeader.length + tablesBlock.length);
-    headerFull.set(fileHeader, 0);
-    headerFull.set(tablesBlock, fileHeader.length);
-    if (headerFull.length > PAGE_SIZE) throw new Error("too many tables for one page");
-
-    const page0 = new Uint8Array(PAGE_SIZE);
-    page0.set(headerFull, 0);
-
-    let totalLen = PAGE_SIZE;
-    for (const c of chains) totalLen += c.pages.length * PAGE_SIZE;
-    const out = new Uint8Array(totalLen);
-    let off = 0;
-    out.set(page0, off); off += PAGE_SIZE;
-    for (const c of chains) {
-        for (const p of c.pages) {
-            if (p.length !== PAGE_SIZE) throw new Error("page size mismatch");
-            out.set(p, off); off += PAGE_SIZE;
-        }
-    }
-
-    await mkdir(dirname(path), { recursive: true });
-    await writeFile(path, out);
-}

maple-ts/src/scan.ts

@@ -1,46 +0,0 @@
-import { readdir } from "node:fs/promises";
-import { join, extname, basename, dirname, isAbsolute, resolve } from "node:path";
-
-const AUDIO_EXTS = new Set([".mp3", ".flac", ".wav", ".aiff", ".aif", ".m4a"]);
-
-async function walk(dir: string): Promise<string[]> {
-    const out: string[] = [];
-    const entries = await readdir(dir, { withFileTypes: true });
-    for (const e of entries) {
-        const p = join(dir, e.name);
-        if (e.isDirectory()) {
-            out.push(...(await walk(p)));
-        } else if (e.isFile()) {
-            out.push(p);
-        }
-    }
-    return out;
-}
-
-export async function scanAudio(inputDir: string): Promise<string[]> {
-    const all = await walk(inputDir);
-    return all.filter((p) => AUDIO_EXTS.has(extname(p).toLowerCase())).sort();
-}
-
-export async function parseM3u8(playlistPath: string): Promise<string[]> {
-    const base = dirname(playlistPath);
-    const text = await Bun.file(playlistPath).text();
-    const entries: string[] = [];
-    for (const raw of text.split(/\r?\n/)) {
-        const s = raw.trim();
-        if (!s || s.startsWith("#")) continue;
-        entries.push(isAbsolute(s) ? resolve(s) : resolve(join(base, s)));
-    }
-    return entries;
-}
-
-export async function scanPlaylists(inputDir: string): Promise<Map<string, string[]>> {
-    const all = await walk(inputDir);
-    const playlists = all.filter((p) => extname(p).toLowerCase() === ".m3u8").sort();
-    const out = new Map<string, string[]>();
-    for (const p of playlists) {
-        const stem = basename(p, extname(p));
-        out.set(stem, await parseM3u8(p));
-    }
-    return out;
-}

maple-ts/tests/strings.test.ts

@@ -1,24 +0,0 @@
-import { expect, test } from "bun:test";
-import { encodeDevicesql } from "../src/pdb/strings.ts";
-
-test("empty encodes to 0x03", () => {
-    expect(Array.from(encodeDevicesql(""))).toEqual([0x03]);
-});
-
-test("short ascii uses short form", () => {
-    const out = encodeDevicesql("ABC");
-    // length = 3+1 = 4; (4<<1)|1 = 9
-    expect(out[0]).toBe(9);
-    expect(Array.from(out.slice(1))).toEqual([0x41, 0x42, 0x43]);
-});
-
-test("non-ascii uses utf-16 form", () => {
-    const out = encodeDevicesql("é");
-    expect(out[0]).toBe(0x90);
-    // total_length = utf16 bytes (2) + 4 = 6
-    expect(out[1]).toBe(6);
-    expect(out[2]).toBe(0);
-    expect(out[3]).toBe(0);
-    expect(out[4]).toBe(0xe9);
-    expect(out[5]).toBe(0x00);
-});

maple-ts/tests/writer_smoke.test.ts

@@ -1,30 +0,0 @@
-import { expect, test } from "bun:test";
-import { mkdtemp, readFile, rm } from "node:fs/promises";
-import { tmpdir } from "node:os";
-import { join } from "node:path";
-import { newDatabase, newTrack } from "../src/model.ts";
-import { writePdb } from "../src/pdb/writer.ts";
-import { PAGE_SIZE } from "../src/pdb/pager.ts";
-
-test("writes a multi-page-aligned pdb file", async () => {
-    const dir = await mkdtemp(join(tmpdir(), "maple-ts-"));
-    try {
-        const db = newDatabase();
-        db.artists.push({ id: 1, name: "A" });
-        db.albums.push({ id: 1, name: "Alb", artist_id: 1 });
-        db.tracks.push(newTrack({
-            id: 1, title: "T", artist_id: 1, album_id: 1,
-            filename: "t.mp3", file_path: "/Contents/A/Alb/t.mp3",
-        }));
-        db.playlist_nodes.push({ id: 1, parent_id: 0, sort_order: 1, name: "P", is_folder: false });
-        db.playlist_entries.push({ playlist_id: 1, track_id: 1, entry_index: 1 });
-
-        const out = join(dir, "export.pdb");
-        await writePdb(db, out);
-        const buf = await readFile(out);
-        expect(buf.length % PAGE_SIZE).toBe(0);
-        expect(buf.length).toBeGreaterThanOrEqual(PAGE_SIZE * 6);
-    } finally {
-        await rm(dir, { recursive: true, force: true });
-    }
-});

maple-ts/tsconfig.json

@@ -1,15 +0,0 @@
-{
-    "compilerOptions": {
-        "target": "ESNext",
-        "module": "ESNext",
-        "moduleResolution": "bundler",
-        "types": ["bun-types"],
-        "strict": true,
-        "esModuleInterop": true,
-        "allowSyntheticDefaultImports": true,
-        "skipLibCheck": true,
-        "noEmit": true,
-        "verbatimModuleSyntax": false
-    },
-    "include": ["src/**/*.ts", "tests/**/*.ts"]
-}

maple.sublime-project

@@ -1,36 +1,54 @@
 {
-	"folders":
+    "folders":
-	[
+    [
-		{
+        {
-			"path": ".",
+            "path": ".",
-		},
+        },
-		{
+    ],
-			"path": "h:ome\\ntr\\code\\rekordcrate",
+    "settings":
-		},
+    {
-		{
+        "LSP":
-			"path": "U:sers\\nathanrashleigh\\code\\code\\rekordcrate",
+        {
-		},
+            "LSP-pyright":
-		{
+            {
-			"path": "C:\\Users\\ntr\\code\\rekordcrate"
+                // Use maple-py/ as the python project root so pyrightconfig.json
-		},
+                // there is picked up (extraPaths=["src"], venvPath=".venv",
-	],
+                // pythonVersion="3.14"). The interpreter is the uv-managed venv.
-	"settings":
+                "settings":
-	{
+                {
-		"cargo_build":
+                    "python.pythonPath": "$folder/maple-py/.venv/bin/python",
-		{
+                    "python.analysis.extraPaths":
-			"paths":
+                    [
-			{
+                        "$folder/maple-py/src",
-				"C:\\Users\\ntr\\code\\maple\\maple-rs":
+                    ],
-				{
+                    "python.analysis.typeCheckingMode": "basic",
-					"variants":
+                    "python.analysis.diagnosticMode": "openFilesOnly",
-					{
+                    "python.analysis.autoImportCompletions": true,
-						"run":
+                    "python.analysis.indexing": true,
-						{
+                },
-							"target": "--bin maple",
+                // Pin the LSP server's working directory to maple-py/ so file
-						},
+                // lookups resolve relative to where pyrightconfig.json lives.
-					},
+                "initializationOptions":
-				},
+                {
-			},
+                    "pythonPath": "$folder/maple-py/.venv/bin/python",
-		},
+                },
-	},
+            },
+        },
+        "cargo_build":
+        {
+            "paths":
+            {
+                "$folder/maple-rs":
+                {
+                    "variants":
+                    {
+                        "run":
+                        {
+                            "target": "--bin maple",
+                        },
+                    },
+                },
+            },
+        },
+    },
 }